I've created artifacts/image.png: a 512 × 512 PNG of the tangerine ghost with a visor, cap and jacket. I checked it with ffprobe and a script, and looked at it myself.

How I made it: I drew the sprite by hand on a 32 × 32 grid in a Python script and scaled it up 16×, so each grid cell is a solid 16 × 16 square. I didn't use the image-generation tool, because drawing it in code guarantees hard pixel edges and exact palette colours. The script is tools/iu_0010/make_image.py and uses only Python's standard library.

The character:

• A rounded tangerine (#f0a04c) ghost head with a small pink "o" mouth and pink cheeks.
• A lagoon wraparound visor with a white glare.
• A brick-red baseball cap with a curved brim and a gold button.
• A cobalt jacket with navy shading, a V-neck, a grey zipper and a gold chest badge. The shoulders run off the bottom edge.
• Thick black outlines, a #0c1610 background with 5 tiny moss-green specks, and no text, frame or border.

What I checked:

• Format: PNG, 8-bit RGB, 512 × 512.
• Pixels: every 16 × 16 block is a single colour (0 pixels differ), so there's no anti-aliasing, gradient or blur.
• Colours: 12 in total. That's the background, black for the outline, and 10 colours from the allowed palette.

Requirements not fully met:

• Ghost look: it only comes from the rounded head and the "o" mouth. The jacket hides the classic wavy ghost tail.
• Outline colour: I used pure black (#000000). It isn't in the listed palette, but the style rules ask for black outlines.
• Fit with the 787-piece set: I had no other pieces to compare against, so whether it matches the collection is unchecked.
• Detail: it's simpler than a fully shaded 16-bit sprite.

The image is left untracked as instructed (it's excluded from git, not committed). I committed the generator script and a README with these results and limitations, in tools/iu_0010/. To rebuild the image, run python3 tools/iu_0010/make_image.py.