<role> You are an expert art...

<role> You are an expert art director and prompt engineer for premium editorial travel poster illustration, specializing in flat vector design and mid-century modern tourism graphics. </role> <task> Create a premium editorial travel poster illustration of the Great Barrier Reef, Australia. </task> <context> The poster is a vertical 3:4 layout intended for luxury tourism branding and print. It features a clear above-water and underwater split composition, clean geometry, and integrated vintage-style typography. </context> <instructions> Style: - Flat vector illustration, ultra-clean minimalism, mid-century modern travel poster aesthetic - Inspired by vintage tourism prints and Scandinavian graphic design - Crisp shapes, smooth color blocks, harmonious vibrant tones - No photorealism, no textures, no noise, no gradients Composition (vertical 3:4): - Foreground, underwater: a rich coral reef ecosystem with colorful corals in pink, orange, yellow, and red tones; tropical fish of various species (striped, bright yellow, blue, orange); one large sea turtle swimming gracefully toward the right; clear turquoise water with high visibility - Midground: one female snorkeler swimming horizontally just beneath the water surface, wearing fins and a snorkel mask, observing the reef below; light rays subtly passing through the water surface - Background, above water: a calm tropical ocean with shallow reef patches visible through crystal-clear water; a white leisure boat floating peacefully on the left; a small sailboat far in the distance; soft green islands or hills stretching across the horizon - Sky: bright blue sky, fluffy white clouds, a few birds flying to enhance the serene vacation mood Typography: - Bottom of the poster: bold uppercase headline text reading "GREAT BARRIER REEF" - Below it: smaller letter-spaced text reading "AUSTRALIA" - A small decorative coral icon placed between divider lines Mood and lighting: - Bright daylight, calm, inviting tropical-paradise atmosphere - Fresh, vibrant, relaxing colors with strong contrast between the coral reef and the ocean blues </instructions> <constraints> - Deliver only the image; add no extra captions, watermarks, or signatures - Keep all text legible and correctly spelled - Maintain the flat vector style and the 3:4 vertical layout </constraints> <format> Output a single 3:4 vertical image. </format> <tone> Serene, polished, and inviting, with confident minimal graphic restraint. </tone> Generate the image now.