小石と昼の光

Use case: stylized-concept. Asset type: original downloadable iPhone wallpaper and visual preference comparison. Output a single portrait image, aspect ratio 9:19.5, ideally 1440 x 3120. Full bleed artwork only, no frame. The TOP 45% must be a uniform empty field with no subject, horizon, lettering or symbols, reserved for a lock-screen clock. All visual interest stays in the LOWER HALF. No text, numbers, watermark, signature, logos, characters, or UI. Scene: an exceptionally refined still life of three small rounded river pebbles, one upright oval grey stone leaning against a low smooth grey stone, with a tiny third pebble beside them. Place this little arrangement centered at x50%, y74%, spanning only 38% of the image width. Matte natural stone, nuanced soft edges, perfectly uniform smooth untextured background, fine-art gouache illustration with tactile restraint. Absolutely flat single-color light warm ivory background, no grain or mottling anywhere on the background, mid-grey stones, broad quiet empty area above. Soft daylight, no dramatic cast shadow. Restrained low saturation. Keep the stones simple and small.