Cinematic 8k wallpaper, immense Cthulhu towering near a lighthouse on a rugged, moss-covered cliff, turbulent sea raging below, crystal-clear focus, inducing megalophobia, intricately detailed 4k digital painting with subtle organic luminescence, photorealistic and movie-quality, enveloped in a dark, moody atmosphere, light reflections dance on the water's surface, capturing atmospheric lighting, detailed subsurface scattering, pushing the limits of hyperrealism, extraordinarily detailed and breathtakingly realistic photo 64k UHD, captured with DSL-like precision, enhanced with Unreal Engine 5 elements, rendered in Octane for striking sharpness, 8k resolution.