A detailed 3D model of Cthulhu, the ancient cosmic entity from H.P. Lovecraft's Cthulhu Mythos. It features a massive, octopus-like head with writhing tentacles covering the mouth, a bloated and scaly humanoid body with elongated limbs ending in massive claws, and enormous bat-like wings sprouting from its back. The creature is posed in a menacing stance, as if awakening from slumber in dark, eldritch ruins under a stormy, otherworldly sky. Style: realistic dark fantasy, high-poly with intricate textures, green-tinted skin, glowing red eyes, atmospheric fog and slime effects for horror vibe.