Back to Resources
GuidesΒ·7 min readΒ·

Colour analysis with Claude: find the colours that lend you light, in 15 minutes and 4 photos

Upload 4 photos, get a palette with hex codes, and stop buying the top that looks great on the hanger and terrible on you.

Some colours lend you light. Some quietly borrow it back.

You already know this happens. There's a jumper you always get complimented in and you've never worked out why. There's also a top you loved in the shop that you've worn twice, because every time you put it on you look like you've had 4 hours sleep.

That's not the top. That's the colour taking light off your face instead of putting it there. Undertone, depth and contrast are doing the work, and nobody explains them to you, so you keep buying by what looks nice on the hanger and finding out in your own bathroom mirror at 8am.

A proper colour analysis costs between $200 and $500 in most Australian cities. It's genuinely good and if you want the in-person version, go. But you can get 80% of the useful part in 15 minutes with 4 photos and a prompt that's been told exactly what to look at.

What's inside

  • The 4 photos to take, and the 3 that ruin the analysis
  • A prompt that reads undertone, depth and contrast separately instead of guessing a season
  • A palette with hex codes you can screenshot and shop from
  • I ran this before a wardrobe clear-out and it explained 6 things I owned and never wore. I didn't bin them. I just moved them away from my face.

What you need

  • Claude, free plan is fine
  • 4 photos of yourself, taken today
  • 15 minutes

Take the photos properly

The analysis is only as good as the light, so this bit matters more than the prompt. Take these 4: face straight on in daylight near a window, face in outdoor shade, one of the inside of your wrist in daylight, and one of your hair in daylight with a section lifted so the roots and mid-lengths both show. Do not use: flash, a bathroom mirror, anything with a filter, or a photo from more than a week ago if you've coloured your hair since. Have your hair pushed back off your face, wear something white or off-white on your top half if you can, and skip makeup on the day, or at minimum leave your lips bare. Fake tan will send the whole thing sideways, so if you've got some on, wait it out.

The prompt

Copy the colour-analysis prompt
You are a colour analyst trained in the 12-season system, but you diagnose from first principles rather than jumping to a season name.

I'm uploading 4 photos: my face in indoor daylight, my face in outdoor shade, the inside of my wrist, and my hair in daylight.

Before anything else, assess the photos themselves. Tell me which ones are usable and which are compromised by warm indoor lighting, colour cast, filtering or shadow. If a photo is unusable, say so and tell me what to retake. Do not analyse around a bad photo and hope for the best.

Then work through the three dimensions SEPARATELY and in this order. Do not name a season until step 4.

1. UNDERTONE. Warm, cool, neutral-warm, neutral-cool or true neutral. Tell me the specific evidence: the cast in the whites of my eyes, the colour of the skin at my inner wrist, the tone in my hair at the roots, how the shade photo differs from the daylight one. Give me your confidence as high, medium or low, and say what's making it uncertain.

2. DEPTH. Where my overall colouring sits from very light to very deep, judging hair, skin and eyes together rather than any one of them. Same evidence-then-confidence format.

3. CONTRAST. The gap between my hair, skin and eyes. High contrast, medium, or low. This is the one most people get wrong about themselves, so be specific about what you're measuring.

4. Now, and only now, name the season that best fits, plus the second most likely one. Explain what separates them and what I could look at to tell for certain.

5. THE PALETTE. Give me 12 colours with hex codes and plain-English names, grouped as:
   - 4 hero colours to wear right next to my face
   - 4 supporting colours
   - 2 neutrals that work as a base
   - 2 that read as "my version of black and white"
   Beside each, one line on why it works with my specific undertone and depth.

6. THE AVOID LIST. 5 colours that will take light off my face, with the reason for each. Then, importantly: for each one, tell me where I could still wear it (trousers, a bag, a jacket worn open) rather than telling me to get rid of it.

7. METALS AND FACE. Silver, gold, rose gold or mixed, and why. Then 3 specifics for makeup: my best lip family, my best blush temperature, and whether warm or cool eyeliner suits me better.

8. THE 20-SECOND TEST. Give me one rule of thumb I can apply in a shop without opening my phone.

Rules: Australian English. Never tell me to throw clothing away. Be honest about uncertainty rather than confident and wrong. Photos have limits, and I'd rather know where yours are.

How to use it

  1. 1Upload all 4 photos in one message with the prompt. Do them together, because Claude needs to compare the daylight and shade shots against each other.
  2. 2If it flags a photo, retake that one before you read anything else. A single warm-lit photo will push a cool undertone read to warm and everything after it inherits the mistake.
  3. 3Screenshot the palette section with the hex codes and save it to your phone favourites. That's the bit you'll actually use, standing in a shop, deciding in 20 seconds instead of 10 minutes.
  4. 4Make it yours: follow up with "here are 8 things I already own and wear a lot [upload photos], which of these are working with my palette and which are working against it?" Way more useful than a shopping list, because it starts with the wardrobe you've got.

Bonus: Audit what's already in your wardrobe

Copy wardrobe audit prompt
Here are photos of the 15 items I wear most [upload them]. Using my palette from the analysis, sort them into: works beautifully near my face, works but keep it below the waist, and fights my colouring. For anything in the third group, tell me what I could pair it with to neutralise the problem before I consider replacing it. Then tell me the 3 gaps in my wardrobe that would make the most outfits work, in order of impact.

Bonus: Build one capsule you can't get wrong

Copy capsule-builder prompt
Using my palette, build me a 12-piece capsule for [your climate and your actual life, e.g. Sydney summer, office 3 days a week, no formal events]. Every piece must combine with at least 4 others. Give me the exact colour with the hex code for each item, not just "a blue top". Then show me 8 complete outfits from those 12 pieces, and tell me which single piece is doing the most work so I know where to spend.

Bonus: Work out why one specific item feels wrong

Copy item-fixer prompt
Here's a top I own that I never feel good in [upload photo of the item, plus a photo of me wearing it in daylight]. Using my analysis, tell me whether the issue is the colour's undertone, its depth, its saturation, or something else entirely like the neckline putting the colour too close to my jaw. If it's fixable with a layer, a scarf or a different lip colour, tell me exactly what to try.

Do this today: take the 4 photos while there's still daylight. That's 3 minutes and it's the only part you can't do from the couch.

Ready to go deeper?

Build your own AI assistant in one afternoon.

A step-by-step guide to building a custom AI assistant that actually fits your life and work β€” no coding, no overwhelm, just a system you can use from day one.

Get the guide β€” $47

Daily Stack

The tools behind the work.

The tools that have earned a permanent spot in my workflow.