Cinematic 8k wallpaper, colossal Cthulhu emerging from the depths near a weathered lighthouse perched on a jagged, moss-covered rock; the turbulent sea crashes unpredictably, captured in sharp focus for megalophobia-inducing effect. This highly intricate 4k digital painting features an organic luminescence that enhances its photorealism, resembling movie-quality artwork, drenched in a dark, moody atmosphere. Lumen reflections dance across the water, with atmospheric lighting and subsurface scattering contributing to the hyperrealism. Impeccably detailed, this scene could belong in a 64k UHD DSLR shoot, with sharp focus akin to Unreal Engine 5 and Octane Render outputs, pushing the boundaries of 8k visual storytelling.