Poseidon, majestic lord of the seas, emerges from the depths, his powerful head and shoulders rising above the waves, framed by a halo of vibrant, iridescent coral, his beard and hair flowing like seaweed, with hints of turquoise and mother-of-pearl. Inspired by the dramatic lighting of Caravaggio, the expressive brushstrokes of Delacroix, and the mythical realism of Arthur Rackham, in a rich, oceanic color palette, with intricate textures and subtle shimmering effects, evoking the mystery and grandeur of the underwater realm.