Fantasy, underwater, Eucritta, Melanolimnetes, ancient ruins, mysterious atmosphere, dark blue-green lighting, seaweed-covered pillars, intricate carvings, glowing jellyfish, shimmering scales, iridescent tail, flowing hair, majestic posture, regal accessories, ornate crown, delicate fingers, soft focus, cinematic composition, misty background, dreamy ambiance, mythical creature.