Shimmering Blue Fish School

Goal: Create a highly detailed vertical marine illustration of a crowded school of fish, like a shimmering watercolor-and-ink poster on a clean white background. Canvas: Portrait orientation, 2:3 ratio, edge-to-edge composition with no frame. Leave small white gaps between fish, and add a tiny date and artist signature in the bottom-right corner. Subject details: Show exactly 55 fish total: 5 large feature fish and 50 smaller baitfish. The 5 large fish are: 1 huge blue tuna-like fish across the top with a tall dorsal fin and large golden eye, partially cropped at the right edge; 1 long silver-and-blue barracuda-like predator across the middle-left with pointed snout and visible teeth; 1 pink-red snapper-like fish on the right-center with golden eye and rosy fins; 1 large deep-blue tuna-like fish across the lower middle with round black eye and pale belly; 1 long silver-blue barracuda-like predator along the lower section with sharp jaw and teeth. The 50 smaller fish are slim sardine or mackerel shapes, mostly swimming horizontally left-to-right or right-to-left, distributed densely between and around the larger fish, with a few partially cropped at the edges. Visual style: Intricate watercolor illustration mixed with fine pen-and-ink linework, bright reflective scales rendered as hundreds of circular sequin-like dots, metallic sparkle, crisp anatomical fish outlines, transparent fins, detailed eyes, and layered blue shadows. Use a luminous ocean palette dominated by {argument name="main color palette" default="cobalt blue, ultramarine, icy white, silver, and pale cyan"}, with one contrasting fish in {argument name="accent fish color" default="pink, coral red, and warm gold"}. The overall feeling should be refreshing, summery, humid, and bright, like a decorative AI art print. Text content: In the bottom-right corner, add the small printed date {argument name="date text" default="July 11, 2026"} and a delicate handwritten signature {argument name="signature" default="Oyagi"}. Keep the text tiny and unobtrusive. Constraints: No humans, no scenery, no water surface, no bubbles, no border, no extra typography. Maintain dense fish layering but keep every fish clearly outlined against white negative space.