I've made artifacts/image.png: a 512 × 512 PNG of a lilac bear with big eyes, no headgear and steel armor. I checked the file with a small Python script: it's a valid PNG, 8-bit RGB with no alpha channel. ffprobe isn't installed here, so I couldn't use it.

How I made it: tools/make_bear.py draws the bear on a 32 × 32 grid using only the Python standard library. It then scales each grid square up to 16 × 16 output pixels with hard edges and writes the PNG directly. I didn't use the image-generation tool. Drawing it in code was the surest way to get exact square pixels, palette colours and outlines, with no blur or gradients.

What's in the picture:

• Lilac (#b39cff) head with round ears and bubblegum inner ears and cheeks.
• Big navy eyes with bone highlights, and a bone muzzle with a black nose.
• Steel armor with a gold collar, gold rivets, and a cobalt chest plate with a phosphor core light.
• A thick black outline around every shape.
• The character is centred and the shoulders reach the bottom edge.
• A #0c1610 background with six tiny moss-green specks, and no text, frame or border.

Colour check: the decoded image contains 11 colours, so there are no blended or smoothed pixels. Ten come from the brief: the background colour plus nine of the 14 palette colours. The eleventh is the outline colour.

Requirements not fully met:

• The outline is pure black (#000000), which isn't one of the 14 palette colours. I treated it as allowed because the brief asks for a black outline.
• I haven't compared the image with the rest of the 787-piece set, so someone still needs to check that it fits the collection.

README.md records the size, format, checks and these limitations. I left the image untracked and didn't commit anything.