Material pixel photo poster

Pair one real photograph with a sparse shell-and-mineral material seal built from its most memorable forms and colors.

Create one independent vertical 3:4 poster from exactly one supplied photograph.\n\nPhoto subject and mood: {{brief}}\nMaterial seal focus override: {{focus}}\nMinimal caption override: {{caption}}\nMaterial direction: {{material_direction}}\nReference image: {{reference_image}}\n\nDivide the canvas into two equal horizontal halves at the exact midpoint. The upper 50% must preserve the original photograph's subject identity, structure, pose, proportions, realistic texture, natural light, and color atmosphere. Only make a minimal crop or naturally extend sky, ground, or surrounding background for the page; never stretch, warp, mirror, or repaint the subject. Apply only a restrained high-end editorial grade.\n\nIn the lower 50%, understand the photograph's most memorable subject, contour, perspective, structural direction, and atmosphere, then rebuild it as a small material collage seal rather than a literal copy. Use uniform or near-uniform square shell slices, chipped shell pieces, mineral-layer fragments, or mixed natural material squares. Keep matte powdery grain, natural striation, subtle relief, slight broken edges, and calm handmade irregularity. Avoid standard mosaic, game pixels, smooth vector blocks, or glossy plastic.\n\nKeep the lower seal small, about 30%–45% of the lower half, with a centered, off-center, edge-hugging, suspended, cropped, or diagonal placement chosen from the source. Cluster modules densely only in the core; progressively reduce, break, float, and dissolve them into generous warm-white negative space. Use no more than 200 modules. Treat the empty paper as an active compositional element and omit information rather than filling the page.\n\nRemix the source's brightest living colors into a clean, luminous palette such as clear sky blue, water cyan, fresh green, warm yellow, coral, or peach, while preserving natural shell and mineral color variation. Keep the result bright, fresh, tactile, quiet, and premium; avoid muddy grey-brown, faded Morandi, gloomy earth tones, fluorescent color, and cheap candy gloss. Add only a few quiet words or a short scene-derived phrase unless an explicit caption override is supplied. Return one poster only.

No multi-photo collage, unequal split, third section, stretched or warped subject, repainted upper photograph, standard mosaic, game pixels, smooth vector blocks, glossy plastic, strong nacre, flat color blocks, more than 200 modules, filled lower half, oversized seal, muddy grey-brown palette, faded Morandi, gloomy earth tones, fluorescent colors, cheap candy gloss, excessive text, slogans, logos, signatures, watermarks, UI, or unrelated decoration.