Last updated: October 8, 2026 | Reading time: 9 minutes
Written by the Diamond Painting Guide team — crafters who've finished 30+ custom kits from family photos, pets, and wedding shots.
If your custom diamond painting arrived looking blurry, blocky, or nothing like your dog — size was almost certainly too small. Not your photo. Not your skills.
This guide shows you exactly what size to order and whether to choose square or round drills, with drill-count charts, time estimates, and combo recommendations for 6 common photo types. No guesswork.
In this guide:
- Why Size and Drill Shape Matter More Than Megapixels
- How Canvas Size Controls Detail (With Real Numbers)
- Minimum vs. Ideal Sizes by Photo Type
- How Long Will It Actually Take?
- Square vs Round Drills: An Honest Comparison
- Best Size + Drill Combos for Your Photo
- 5 Photo Tips That Save Any Custom Kit
- What Makes a Quality Custom Kit?
- 60-Second Decision Checklist
- FAQ
1. Why Size and Drill Shape Matter More Than Megapixels
Think of diamond painting as a mosaic, not printing. Every resin drill is one chunky pixel, about 2.7mm wide.
A phone photo might have 12 million pixels. That same image turned into a 30×40cm canvas? Only about 13,000 drills. You're compressing millions of details into thousands of dots. Something has to give — usually eyes, smiles, and fur texture.
Bottom line: When detail disappears, 80% of the time the cause is:
- Canvas too small for the number of faces/details
- Wrong drill finish for the subject (soft glow vs. crisp edge)
- Busy background competing with the main subject
Go from 30×40cm to 60×80cm and you don't get a little more detail — you get roughly 4x more drills. That's the difference between a fuzzy thumbnail and a clear portrait you actually want to frame.
New to the hobby? Start with What Is Diamond Painting? then come back here before you order custom.
2. How Canvas Size Controls Detail (With Real Numbers)
More centimeters = more drills = more information from your photo survives.
How many drills are in common sizes?
Because drills are a fixed size, we can estimate total drill count pretty accurately. Use this to compare:
| Canvas Size (design area) | Approx. Drills | Detail Level | Good For |
|---|---|---|---|
| 30×40 cm | 12,000 – 15,000 | Low | Simple florals, single object, practice |
| 40×50 cm | 20,000 – 28,000 | Medium | One portrait, one pet close-up |
| 50×70 cm | 35,000 – 48,000 | High | Couples, detailed pets, architecture |
| 60×80 cm | 55,000 – 70,000 | Very High | Families, weddings, landscapes |
| 70×90 cm+ | 80,000+ | Maximum | Groups of 4+, wall art |
DIY math if you need it:
Width (cm) ÷ 0.28 × Height (cm) ÷ 0.28 = approx. drills
Example: 50 ÷ 0.28 (178) × 70 ÷ 0.28 (250) = ~44,500 drills
The Face-Height Rule (Don't Skip This)
For any photo with people or pets, use this pro check:
Each face should be at least 6–8 cm tall on the final canvas. Smaller than that, and eyes and mouths melt into 3–4 drills.
How to check: Measure the face height in your photo as a % of the total image height, then multiply by canvas height.
Example: Your daughter's face is 20% of the photo height. On a 40×50cm canvas (50cm tall), her face will be 10cm tall — perfect. On that same photo with three kids side-by-side, each face might be only 4cm tall — too small. Size up to 60×80cm.
If you're on the edge, always go one size up. No one ever regrets ordering bigger for a portrait.
3. Minimum vs. Ideal Sizes by Photo Type
Minimum = it will be recognizable. Ideal = it will look like them and you'll want to frame it.
| Your Photo | Don't Go Below | We Recommend | Why |
|---|---|---|---|
| Single portrait (head & shoulders) | 40×50 cm | 50×70 cm | Skin gradients need room to blend |
| Couple / two people | 50×70 cm | 60×80 cm | Two sets of eyes need double the drills |
| Family / group (3+ people) | 60×80 cm | 70×90 cm or larger | Small background faces blur first |
| Pet with dark or white fur | 40×50 cm | 50×70 cm | Fur texture disappears on small grids |
| Buildings, streets, sharp lines | 50×70 cm | 60×80 cm | Straight edges wobble when compressed |
| Flowers, abstract, landscape | 30×40 cm | 40×50 – 50×70 cm | Soft shapes forgive smaller sizes |
Choosing a photo too? Read this first: How To Choose The Absolute Perfect Photo for Custom Diamond Paintings
4. How Long Will It Actually Take? Be Honest With Yourself
Large canvases look amazing — and they take weekends, not evenings.
From our own timing (and reader polls):
- Single placer: ~1,000 drills = 25–35 minutes
- Multi-placer (3–6 drills at once): ~1,000 drills = 12–18 minutes
- Square drills: add 20–30% more time than round (you'll straighten rows)
| Canvas | Total Drills | Relaxed Pace (1hr/day, single) | Speedy Pace (multi-placer) |
|---|---|---|---|
| 30×40 cm | ~13,000 | 7–10 days | 3–5 days |
| 40×50 cm | ~24,000 | 2–3 weeks | 1–2 weeks |
| 50×70 cm | ~44,000 | 4–6 weeks | 2–3 weeks |
| 60×80 cm | ~62,000 | 6–9 weeks | 3–5 weeks |
Our advice: If this is your first custom, don't start with 60×80cm unless you love long projects. A 40×50cm or 50×70cm single portrait is the sweet spot — detailed enough to thrill you, small enough to actually finish.
5. Square vs Round Drills: An Honest Comparison
Both are 5D resin drills in most modern kits. The difference isn't quality — it's finish and feel.
In one sentence: Square drills look sharper and more photo-like. Round drills feel faster, easier, and sparklier.
| Square Drills | Round Drills | |
|---|---|---|
| Finished look | Crisp mosaic, edge-to-edge, no gaps | Soft glow, tiny gaps catch light |
| Detail | Excellent for eyes, fur, text, straight lines | Good, but fine lines look slightly rounded |
| Speed | Slower — placement must be precise | 20–30% faster, very forgiving |
| Difficulty | Intermediate — crooked drills show | Beginner-friendly — gaps hide mistakes |
| Sound & feel | Satisfying “click” when aligned | Smooth, meditative rhythm |
| Best for | Portraits, pets, architecture, realism | Florals, sunsets, abstract, first kits |
Choose square drills if:
- Your photo has 1+ faces you want to recognize instantly
- It's a pet with layered fur, whiskers, or dark eyes
- You love precision and don't mind using tweezers + a straightener
- You plan to frame without glass and view up close
Choose round drills if:
- This is your first or second kit
- Your image is flowers, landscape, mandala, or abstract
- You craft to relax, not to perfect every row
- You have hand stiffness — round drills need less pressure
Still confused by labels like full-drill, partial, 3D vs 5D? We break it all down here: Round vs. Square Drills: What's the Difference?
6. Best Size + Drill Combos for Your Photo (Cheat Sheet)
Bookmark this table when you order:
| Photo Scenario | Order This Size | Pick These Drills | Pro Note |
|---|---|---|---|
| Solo headshot, good lighting | 50×70 cm | Square | Only drop to 40×50 if face fills 60%+ of frame |
| Couple, wedding, engagement | 50×70 – 60×80 cm | Square for realism, Round for dreamy glow | Match canvas ratio to photo to avoid cropping faces |
| Family of 3–5, kids | 60×80 – 70×90 cm | Square | Check smallest background face is still 6cm+ |
| Dog / cat close-up | 50×70 cm | Square | Side daylight shows fur layers best |
| House, street, landmark | 50×70 – 60×80 cm | Square | Avoid wide panoramas — crop tighter |
| Flowers / abstract / sunset | 40×50 – 50×70 cm | Round | Let sparkle do the work, detail matters less |
Aspect ratio tip: If your photo is square (Instagram), order a square canvas (40×40, 50×50). If it's 4:3 phone photo, 40×50 or 60×80 fits best. Don't force a wide group photo onto a tall portrait canvas — you'll lose people on the edges.
7. Five Photo Tips That Matter More Than Megapixels
A great 40×50cm from a clear photo beats a blurry 60×80cm from a dark one. Before you upload:
- Light faces, not backgrounds. Faces in shadow turn to brown blocks. Bright, even daylight on faces = clean color mapping.
- Get closer, crop tighter. Fill 60–70% of the frame with your subject. Distant beach figures become unpaintable dots.
- Simplify the background. Busy trees, railings, and crowds steal drills from faces. Blur or crop them out.
- Skip heavy filters. High contrast, B&W filters, and beauty smoothing confuse the color chart. Send the natural original.
- One sharp focus. If eyes aren't tack-sharp in the original at 100% zoom, they won't be sharp in drills. Pick another shot.
For step-by-step examples, see our photo guide: Customized Diamond Paintings and How To Choose The Absolute Perfect Photo
8. What Makes a Quality Custom Kit? (What to Check Before You Buy)
Size and drills only shine if the base materials are good. Wherever you order, look for:
- Thick, flat canvas (not thin plastic): Should lie flat after unrolling, with clear symbols you can read without squinting. Flocked or velvet-back canvases resist wrinkles.
- Poured glue, not double-sided tape: Poured glue stays even and re-stickable for months. Tape lines dry out and trap air bubbles.
- Consistent resin drills, sorted by DMC code: 13–20 facets is standard for 5D sparkle. Bags should include 10–15% extra and match the legend exactly.
- Human-checked preview: Best sellers send a digital proof showing how your photo translates to drills. Auto-only conversion often turns skin green-gray. Always approve the preview.
- Full kit in the box: Canvas, drills, applicator pen + extra tips, wax, grooved tray, and resealable bags. For your first kit, check our unboxing checklist: What To Do When Your First Kit Arrives
Cheap kits cut corners on glue and drill sorting — that's why drills pop off or colors look muddy, even at large sizes.
9. Your 60-Second Decision Checklist
Answer these three questions in order:
1. How many faces?
1 face → 40×50 minimum / 50×70 ideal
2 faces → 50×70 minimum / 60×80 ideal
3+ faces → 60×80 minimum / 70×90+ ideal
2. Sharp or sparkly?
Want people to say "Wow, that's exactly her!" → Square
Want relaxing shine and faster finish → Round
3. How much time do I have?
A few evenings → 30×40 to 40×50, round
A few weeks → 50×70, either drill type
A long-term wall piece → 60×80+, square
Still stuck? Go bigger + square for people/pets, smaller + round for decor/fun. You won't regret it.
10. Frequently Asked Questions
Is bigger always better for custom diamond painting?
Bigger preserves more detail, but only up to a point. Once faces are 8–10cm tall, going larger mainly adds hours, not likeness. For florals or abstract art, 40×50cm often looks just as good as 60×80cm and finishes twice as fast.
Do square drills really look sharper than round?
Yes. Square drills tile edge-to-edge with no gaps, so eyes, fur edges, and straight lines look crisper up close. The trade-off: crooked placement shows more. Use a light pad, work in small checkerboard sections, and straighten each row with a ruler edge.
Will round drills leave gaps?
Tiny gaps between round drills are normal — that's what creates their extra twinkle under lamps. From normal viewing distance (1m+), you won't see canvas through them on a good poured-glue canvas. If you see a lot of white, the canvas print or drill size is off, not the drill shape.
Can I do a family of four in 40×50cm?
Technically yes, but faces will likely be 3–4cm tall and lose likeness — especially kids in the back row. For 3+ people, start at 60×80cm. If budget or space is tight, crop to just faces/shoulders instead of full bodies.
How do I estimate working time?
Count ~1,000 drills per 25–30 minutes with a single placer, or 12–18 minutes with a multi-placer. A 50×70cm canvas (~44,000 drills) = roughly 18–22 hours total. Divide by how many hours you craft per week for a realistic finish date.
What size diamond painting fits a standard frame?
30×40cm, 40×50cm, 50×70cm, and 60×80cm match ready-made IKEA and craft-store frames in most countries. Custom sizes like 45×65cm may need custom framing. Pro tip: frame without glass so the facets keep sparkling, and seal first if it will hang in sunlight.
Final Thoughts: Size Up, Stress Down
If you remember one thing from this guide: when in doubt for people and pets, go one size larger and choose square drills. The extra drills cost a little more and take longer, but they're the difference between "cute craft" and "I can't believe that's diamonds!"
Ready to start? Pick your sharpest, brightest photo, match the canvas ratio, approve your preview render, and enjoy every sparkly hour.
Happy painting — and don't forget to share your finish! ✨
Found this helpful? Explore more: How-to Guides | Diamond Painting Problems & Fixes | Where to Buy Kits