A cinematic portrayal of a sinister merman with a maniacal grin, his humanoid features enhanced by piercing yellow eyes that glint with a malevolent gleam. His skin mirrors human tones, adding an eerie familiarity, while dynamic lighting casts dramatic shadows across his face and body, emphasizing the melancholy etched into his expression. The dark, nebulous background envelops him, heightening the sense of mystery and danger that surrounds this aquatic creature of the night. Subtle bioluminescent patterns ripple along his scales, providing a haunting, otherworldly glow.