An ancient sunken stone labyrinth at the bottom of a twilight ocean, towering columns of weathered marble covered in swaying sea-whip corals and glowing anemone clusters, a graceful sea turtle with shell of translucent opalescent mosaics swimming through shafts of soft teal light filtering from above, tiny luminous shrimp-spirits with tails of pearl dust trailing behind, delicate sea-vine tendrils creeping across carved stone faces, fine line art with soft watercolor fills, botanical frame border of delicate coral-rose vines and tiny luminous pearl-spore flowers, magical realism, soft teal and amber light rays piercing through water creating ethereal prismatic glow, palette of deep ocean indigo, luminous bioluminescent teal, soft coral, stone gray and glowing amber, enchanted underwater sanctuary at the threshold of dusk, whimsical fantasy art