I've created artifacts/image.png, a 512 × 512 PNG of IU_0483. It's a cobalt bunny with big eyes, an antenna and armor, and it meets the style brief. A Python script checked the file and I looked at the image itself.

How I made it: I drew the bunny by hand on a 32 × 32 grid in tools/make_iu_0483.py and scaled each cell up to a solid 16 × 16 block. I didn't use the image-generation tool. This approach guarantees hard square pixels with no blur or stray colours, which a generative model can't promise. The script uses only the standard library, so the image can be rebuilt offline.

What's in the image:

• One front-facing bust, centred, with the armor shoulders filling the whole bottom edge.
• Cobalt skin with pink inner ears and cheeks.
• Big white eyes with black pupils and a highlight in each.
• An antenna between the ears with a green bulb on a gold base.
• Steel armor with gold trim and a glowing green chest light.
• A thick black outline around every shape.
• A solid #0c1610 background with six small green specks, and no text, frame or border.

Checks:

• The PNG decodes at 512 × 512 in RGB.
• Every 16 × 16 block is a single colour, so the image maps exactly onto the 32 × 32 grid.
• Apart from the background and black outline, every colour comes from the allowed palette.
• ffprobe isn't installed in this environment, so I checked size and format with a small Python decoder instead.

Requirements I couldn't fully meet:

• I couldn't check the "cohesive with a 787-piece set" requirement because I had no other pieces from the set to compare against.
• The outline is pure black (#000000). The brief asks for a black outline but doesn't list black in the palette.

README.md records the dimensions, format, colours used and these two gaps. The script and README are committed. The image is left uncommitted as instructed; this repo's local git settings ignore the artifacts/ folder, so git status won't list it.