Give me a photorealistic image of a merman. He has a light skin

Give me a photorealistic image of a merman. He has a light skin, jet black hair. ravenous black eyes. His features should resemble a man's and he is muscular and massive. The whites of his eyes are black, but they are just distinguishable from the jet-black irises. He must be shown floating in a dark sea cave with green crystals growing on the rock around him. He must be smiling showujg his sharp teeth. He is handsome yet horrifying. Smile, Jewelry, Fang, Best Quality, HD, underwater, mermaid