A whimsical and eerie portrait of Batman with vibrant green skin and glowing yellow eyes, dressed in dark, rusty attire. In one hand, he holds a jar with glowing purple liquid, and in the other, a gun. His mischievous smile adds to the dark, dramatic accents. The background is a mystical, dark green with a Japan-style poster aesthetic, enhancing the supernatural feel. This photorealistic, fantasy-style image features dynamic lighting and intricate details.