Cinematic 8k wallpaper, colossal Cthulhu towering near a weathered lighthouse perched on a moss-covered rock, turbulent sea crashing below, impeccable sharp focus capturing immense scale, invoking megalophobia, intensely detailed digital painting, subtle bioluminescent glow illuminating intricate textures, photorealism with cinematic depth, brooding atmosphere with lumen reflections dancing across waves, dramatic atmospheric lighting, expertly rendered subsurface scattering, ultra-realistic depiction in rich detail, akin to 64k ultra HD photograph, DSLR precision, vibrant sharpness, crafted in Unreal Engine 5 with Octane Render, 8k resolution.