I've made the image at artifacts/image.png: a 512 x 512 RGB PNG. I checked the size, format and every colour it uses with Pillow, and looked over the render myself.

What it shows: a lilac (#b39cff) bear, front-facing bust, centred, with its shoulders running off the bottom edge.

• Ears: bubblegum pink inside.
• Face: a bone-coloured muzzle with a black nose.
• Eyes: a navy visor band with a green (phosphor) glow line and grey (steel) pods on each side.
• Headgear: none.
• Outfit: a cobalt tee with a tiny bone "UI" logo on the chest.

Style: I drew it pixel by pixel on a 32 x 32 grid and scaled it up 16x, so every pixel is a hard square with no smoothing, gradients or blur. Every shape has a black outline one grid pixel thick. The background is solid #0c1610 with six small green specks, and there is no text, frame or scenery besides the UI logo.

Requirements not fully met:

• The outline colour, pure black #000000, isn't in the listed palette. I used it because the brief asks for black outlines. Every other colour comes from the allowed palette.
• I only checked the image by eye. I haven't compared it with the rest of the 787-piece set, so I can't confirm it matches the collection's look.

The script that draws it is tools/gen_iu_0521.py, and README.md records the dimensions, format and the points above. I committed both. Git had no author identity set, so I passed one for that commit only: your name and email, without changing the repository's config. The image itself is untracked as required; the repository's local exclude rules already ignore artifacts/.