A haunting image of a sinister merman emerges from the depths, with an unhinged grin stretching across his face, revealing sharp, menacing teeth. His piercing yellow eyes glow with an unsettling intensity, darting around with an almost predatory anticipation. The merman's skin retains a human-like appearance but glistens eerily under dynamic, moonlit illumination. His form is sleek and powerful, poised as if ready to spring into action. The dark, murky waters around him create a stark, somber contrast, enhancing the melancholy yet terrifying ambiance of the scene.