Create a highly detailed 3D model of Cthulhu from H.P. Lovecraft's mythos. Give it a towering, humanoid body with a bloated, octopus-like head and a face of long, writhing tentacles. Skin should be rough, scaly, dark green or mossy gray, with subtle bioluminescent lines. Add large, ragged bat wings with torn, semi-translucent membranes and visible veins. Limbs should be elongated, with clawed hands and feet. Pose it looming upright, slightly hunched, arms open as if summoning madness. Include barnacles, crustacean growths, and arcane carvings. Eyes glow faint green or violet. Style: dark fantasy realism.