Retro poster of an underwater city with luminous coral arches
Prompt
Retro travel advertisement for 'The Sunken Kingdom of Lumina'. An underwater city with bioluminescent coral structures and majestic, spectral manta rays swimming through grand archways. The poster features bold, 1950s-style typography and a vibrant, yet slightly muted color palette. Inspired by vintage travel posters and the aesthetic of dark fantasy horror.
