Cinematic scene depicting a colossal Cthulhu towering over the raging sea near a solitary lighthouse perched on a moss-covered rock; the atmosphere is dark and moody with stormy skies. The composition features this mythical creature at the center, exhibiting an organic glow against a backdrop of tumultuous waves. The visual is captured in sharp focus, conveying a sense of megalophobia with its immense scale, rendered in breathtaking 8k detail. The artwork showcases photorealistic textures and atmospheric lighting, highlighting subtle details like subsurface scattering and lumen reflections. The scene is crafted with hyperrealism, vast depth, and intricate detail, presenting a movie-quality image. Rendering techniques include Unreal Engine 5 and Octane Render, aiming for an ultra-high-definition appearance akin to 64k quality, with DSLR-like precision, maintaining the essence of a cinematic masterwork while adding unique artistic elements.