A full character turnaround sheet of a bioluminescent deep-sea oracle, ancient merfolk priestess from the sunless trenches, skeletal face half-covered in living coral and phosphorescent sea anemone growths, gill slits glowing with ethereal pale blue light, tattered robes woven from ghostly jellyfish tentacles and ancient sunken coin chains, holding a twisted trident of petrified whale bone with captured glowing深海squid wrapped around, dozens of tiny flashlight fish orbiting her like living constellation, dramatic deep ocean backlighting with towering hydrothermal vent pillars and crushing abyss darkness, deep abyss black phosphorescent blue ghostly white coral pink bioluminescent green and crushing pressure gray color palette, Painterly digital art style, concept art for video game, front and back view with deep sea eldritch details