Underwater, fantasy world, mermaid-themed architecture diagram, intricate shell-shaped buildings, coral reefs, seaweed-covered pillars, shimmering iridescent scales, soft glowing jellyfish lanterns, majestic sea creatures swimming in the background, gentle ocean currents, sunken treasure chests, ancient ruins, mysterious artifacts, worn leather-bound tomes, dusty scrolls, vintage diving helmets, rusty anchors, seashells, pearls, glimmering aquamarine, softbox lighting, warm color palette, dreamy atmosphere, 3/4 composition, symmetrical layout.