zombie apocalypse, survival horror theme, Left 4 Dead inspired, group of survivors, (4 characters), action pose, holding weapons, (shotguns, pistols), torn clothes, bloodstains, facial expressions of determination, urban environment, abandoned buildings, overrun by zombies, dark atmosphere, street lights, foggy, dynamic composition, mid-action shot, intense expressions, detailed textures, gritty realism, emergency lighting, moonlit night, high contrast, dramatic shadows, wide-angle view.