A haunting image of a sinister merman, his maniacal smile revealing sharp teeth, with eerie yellow eyes glowing against his human-like skin. His expression is a mix of madness and ancient melancholy, enhanced by the cinematic shadows playing across his features. The dynamic lighting casts a dramatic contrast against the dark, swirling waters in the background, adding depth and tension to the scene. His webbed fingers and sharp fins add a hint of otherworldly danger, blending seamlessly with his otherwise humanoid form, creating a chilling yet mesmerizing figure.