High quality 3D portrait rendering of a Ghoul standing vigil at the flaming gates of the underworld. Its sinister form is accentuated with a burning skull and piercing ember eyes. The figure is slender, with an intricately detailed skeletal structure draped in tattered rags. Intense, vivid flames crackle and dance chaotically in the background, adding to the dark fantasy horror ambiance. The scene is bathed in dramatic, cinematic red lighting, capturing the essence of a terrifying yet captivating spectacle reminiscent of an artstation masterpiece. The focus is soft, creating an ethereal atmosphere, with an expertly controlled depth of field. There are no extraneous features like horns or unnecessary facial details, preserving the pure, haunting essence of this ghastly guardian.