A chilling portrait of a sinister merman, his expression twisted with a maniacal grin, humanoid features highlighted by piercing yellow eyes. His skin bears a human-like tone, yet hints at an otherworldly presence. The scene is enveloped in dramatic, cinematic lighting, casting shadows that dance across his visage, adding depth and melancholy to his appearance. The dark, ominous background contrasts sharply with his illuminated form, enhancing the mystical aura surrounding this eerie sea dweller.