I made the image and saved it to artifacts/image.png: a 512 × 512 RGB PNG with 12 colours. I looked at the rendered image twice and fixed the problems I saw in between.

What it shows: one ghost seen from the front, head and shoulders, centred.

• Skin: swamp green with flat moss-green shading.
• Headgear: a red-brown bandana with bone dots, knotted on the right with two tails.
• Eyes: a bright green visor with a teal lower band, white glints and small grey hinges.
• Outfit: a blue tee with a dark navy collar and seams, and a tiny bone-white "UI" logo on the chest. The shoulders run off the bottom edge.
• Background: solid #0c1610 with six small green specks.

Every shape has a thick black outline. The character is drawn on a 32 × 32 grid and scaled up 16× with hard edges, so there's no blur, smoothing or gradient. It uses only colours from the allowed list, plus black for outlines and the background colour. There's no text other than the logo, and no frame or scenery.

Requirements that may not be fully met:

• Since it's head and shoulders only, the ghost has no wavy tail. It reads as a ghost only through the rounded head and small "o" mouth.
• I didn't compare it against the rest of the 787-piece set, so I can't confirm it matches that collection's look.

Other files: the script that draws the image is scripts/gen_iu0212.py, and the notes on the result are in README.md. The README was meant to go in artifacts/, but that folder is ignored by git, so I put it at the repo root. Both files are staged but not committed, because git on this machine has no author name or email set and I didn't change your git settings. The image is left untracked as instructed.