Cinematic 8k wallpaper, gigantic Cthulhu 4k, 8k, imposing in the center, positioned near a lighthouse on a rugged, moss-covered rock, ocean waves crashing violently, sharp focus, megalophobia-inducing, exquisitely detailed 4k digital painting, subtle organic luminescence, photorealistic with cinematic flair, movie-quality aesthetics, dark and moody atmosphere, delicate lumen reflections, immersive lighting, sophisticated subsurface scattering, extreme hyperrealism, richly detailed photo 64k UHD, captured with DSLR precision, razor-sharp clarity, rendered using Unreal Engine 5 and Octane, 8k resolution.