Cinematic 8k wallpaper, colossal Cthulhu looming over a lighthouse perched on a rugged, moss-covered rock, turbulent sea swirling around, sharp focus, inducing megalophobia, intricately detailed 4k digital painting, subtle organic luminescence, photorealistic, cinematic, movie-quality visuals, dark and moody ambiance with lumen reflections, atmospheric lighting, detailed subsurface scattering, hyperrealism, exceptionally detailed, highly realistic 64k UHD imagery, captured with DSLR clarity, precise focus, powered by Unreal Engine 5, enhanced with Octane Render, 8k resolution, ethereal mist swirling in the air, adding a sense of otherworldly mystery.