A male with demonic features and lean muscle, posed dramatically, merging seamlessly with an aquatic mermaid tail, intricate scales, tendrils of seaweed entwined, subtle bioluminescent glow, hints of eerie luminescence in the eyes, delicate gills, a fusion of ethereal beauty and deadly allure, hues of dark turquoise, abyssal blues, and foreboding blacks, vibrant yet sinister, huan guang jians unsettling nostalgia, rivalling film noir eeriness