I'll download the candidate image and verify its hash.Hash matches. Now let me view the image.The image loads — a green alien with antennae, dark shades, and blue overalls on a dark background. Let me verify the technical details (grid size, palette, background colour) with code.Analysis confirms full spec compliance:

• Grid: 512×512 with every 16×16 block a single colour — a true 32×32 grid upscaled with hard nearest-neighbour edges. Zero non-uniform blocks, so no anti-aliasing or gradients.
• Palette: exactly 10 unique colours, all from the allowed list — swamp #7cc84a (skin), moss #1b7a35 (shading), navy #2b3a6b + cobalt #6f7fe0 (overalls), gold #e8c548 + bone #f2efe6 (antenna tips/buckles), steel #8a8f96 + rust #7a4a2a (accents), black outlines, bg #0c1610.
• Traits: ASCII render shows glowing-tipped ANTENNAE (rows 0–6), dark SHADES across the eyes (rows 14–17), swamp-green ALIEN head with side frills, and OVERALLS with straps/buckles reaching the bottom edge. Single centered front-facing bust.
• No text, watermark, border, or scenery; background is pure #0c1610.

Writing the review:Reason is over 300 chars — trimming it.Done. artifacts/review.json is written and valid.

Verdict: ACCEPT for slot IU_0016, named "Swamp Signal".

Evidence from verification:

• Hash: sha256 matches 3413af02…fcd5 exactly.
• Pixel-art check: 512×512 PNG, only 10 unique colours, and every 16×16 block is uniform — a genuine 32×32 grid upscaled with hard nearest-neighbour edges, no anti-aliasing or gradients.
• Palette: all colours are from the approved list (swamp, moss, navy, cobalt, steel, rust, gold, bone, black, plus the required #0c1610 background).
• Traits (confirmed by rendering a cell-level map): antennae with glowing gold/bone tips, dark shades, swamp-green alien head, navy overalls with straps and buckles.
• Composition: one front-facing centered bust, shoulders reaching the bottom edge, thick black outlines, no text/watermark/border/scenery.

Scores: brief 10, silhouette 9, style 10, originality 8.