Cinematic 8k wallpaper, colossal Cthulhu rising amidst a storm near a lighthouse perched on a craggy, moss-covered rock; the turbulent sea crashing below. Sharp focus captures the monstrous details with a light organic luminescent glow. The scene is photorealistic, with a movie-quality atmosphere, featuring dark, moody tones and lumen reflections in the water. Atmospheric lighting enhances the scene with subsurface scattering effects, while hyperrealism provides intricate textures on Cthulhu's skin. The setting is exquisitely captured in highly detailed photo quality, using advanced visual engines for a vibrant, lifelike depiction that invokes megalophobia. DSLR quality sharpness, rendered in unreal engine 5 and octane, capturing every feature of this massive entity in breathtaking 8k.