Cinematic 8k wallpaper depicting a colossal Cthulhu emerging from a stormy sea, framed near a weathered lighthouse perched on a moss-covered rock. The scene is captured in sharp focus with a centered composition, evoking megalophobia and showcasing an extremely detailed 4k digital painting. The monstrous entity emits a subtle organic glow, contributing to the photorealistic and cinematic quality of the image, enhanced by dark, moody lighting. Lumen reflections dance on the turbulent water, complemented by atmospheric effects and subsurface scattering that bring a hyperrealism to the scene. The intricate details are captured in 64k UHD, as if shot with a high-end DSLR, utilizing the powerful rendering of Unreal Engine 5 and Octane for an 8k visual masterpiece.