I made the image and saved it at artifacts/image.png: a 512 × 512 PNG with no transparency.

What it shows: one alien bust, facing front and centred, on the dark background #0c1610 with five tiny moss-green specks.

• Skin and face: swamp-green skin, pointed ears, big white-and-lagoon eyes with small white glints, pink blush and a small smile.
• Beanie: brick red with a tangerine stripe, a ribbed rust and brick cuff, and a gold pompom.
• Armour: steel shoulder plates and chest plate with bone highlights and gold rivets, a cobalt collar, navy arms and a phosphor-green gem on the chest. The shoulders run off the bottom edge.

How I made it: I drew the image pixel by pixel in code rather than with an image generator. I placed every pixel on a 32 × 32 grid, then mirrored the left half to make the right. I scaled it up 16 times with hard edges, and a final step adds a black border to any shape edge that lacks one. The script is artifacts/make_image.py and rebuilds the image exactly.

Checks:

• The file is 512 × 512 and PNG format.
• Every 16 × 16 block is one solid colour, so there's no anti-aliasing, gradient or blur.
• Only 15 colours appear: the background, black, and 13 colours from your list. Lilac is the only one not used.
• There's no text, frame or border.
• I looked at the rendered image myself and adjusted the eyes once; nobody else has reviewed it.

Requirements not fully met (also noted in artifacts/README.md):

• The black outline (#000000) isn't in your colour list. I added it because the thick black outline is required.
• I haven't compared it with the rest of the 787-piece set, so I can't say whether it fits that collection.
• Apart from the eye glints, the design is perfectly symmetrical.

git status shows nothing to commit; the artifacts/ files look like they are ignored by Git, which keeps the image untracked as required.