I made artifacts/image.png. It's a 512 × 512 PNG showing a bone-coloured bunny bust with dot eyes, a gold crown and a navy suit.

How I made it: a Python script, tools/make_iu_0399.py, draws the bunny on a 32 × 32 grid and then enlarges it 16 times without smoothing. Every original pixel becomes a hard-edged 16 × 16 square.

Checks I ran:

• Size and format: 512 × 512, PNG, RGB.
• Square pixels: I checked every pixel and each 16 × 16 block is one solid colour, so there's no smoothing or gradient.
• Colours: 11 in total — black for the outlines, the background #0c1610, and nine from the allowed list (bone, steel, bubblegum, gold, brick, lagoon, navy, cobalt, moss). The moss is only used for six small specks in the background.
• Content: I looked at the rendered image. It's a single front-facing bust, centred, with the shoulders reaching the bottom edge. It has a black outline around every shape, long ears with pink insides, a crown with three gems, a suit with a white shirt and red tie, and a tiny gold lapel pin. There's no text, frame or border.

Requirements I couldn't fully meet: none against the written list. I couldn't check whether it matches the rest of the 787-piece set, because I had no other pieces to compare it with. The outlines are one grid pixel thick (16 pixels in the final image).

artifacts/README.md records the size, format, colours and these limitations. Both files under artifacts/ are left untracked, as the instructions asked.

Not committed: I tried to commit the script, but git has no author name or email set up on this machine. I didn't change your git settings, so tools/make_iu_0399.py is in the folder but uncommitted.