I made the image at artifacts/image.png. It's a 512 × 512 PNG (RGB, 2,194 bytes), and I looked at it after rendering it.

I drew it as a 32 × 32 pixel grid in code rather than with an image model. Each grid pixel is scaled up 16 times into a hard 16 × 16 square, so there's no anti-aliasing, blur or gradient. The image contains only 11 colours: black for the outlines, the #0c1610 background, and 9 colours from the palette.

What's in it:

• Bunny: front-facing bust, centred, with phosphor #39ff6a skin, moss shading under the jaw, bubblegum inner ears, cheeks and nose, and 2 × 2 black dot eyes.
• Antenna: a steel stalk with a gold ball on top.
• Suit: navy with cobalt highlights, a bone collar, a brick tie and gold buttons. The shoulders reach the bottom edge.
• Background: solid #0c1610 with 8 tiny moss-green specks. There's no text, frame or scenery.
• Outline: every outer shape has a black outline 1 grid pixel thick (16 px at full size).

Requirements not fully met (also listed in README.md):

• The collar, tie and lapels touch each other directly, with no black outline between them, because a 32-pixel grid has no room for it. All outer shapes are outlined.
• The black outline at the top of the antenna ball sits right on the top edge of the image.
• Nobody has compared it with other pieces in the 787-piece collection, so it may not look consistent with them.

I committed the generator script (tools/draw_iu_0303.py, which needs Pillow) and README.md. The image isn't committed, as instructed; Git's local exclude file already ignores artifacts/.