A photorealistic image of a skull adorned with a gas mask. The skull, perfectly anatomical in detail, exudes an eerie aura of post-apocalyptic survival. The gas mask, with its intricate filters and lenses, fits snugly over the skull, suggesting a fusion of the organic and the mechanical. Emphasize the textures of the skull's bone and the rubber and metal components of the gas mask, capturing a contrast between the mortality symbolized by the skull and the human endeavor to survive represented by the gas mask. The background should be minimalist to keep the focus on the skull and gas mask, perhaps with subtle shadows to enhance the ominous and foreboding atmosphere. --s 250