"Create an image with an aspect ratio of 9:16, depicting an urban alleyway in a photo-realistic manner. This image is intended to be used as a background, and it should resemble reality in every detail. The alleyway is detailed with brick walls, windows, pipes, and scattered urban debris like trash cans, all contributing to the traces of city life. A dim yet significant light source, part of the scene, enhances the atmosphere. Importantly, a UFO appears in the sky, distinctly casting a beam of light onto the urban alleyway. This beam of light from the UFO adds a mysterious and mystical ambiance, emphasizing a sense of immersion and realism so profound that viewers feel as if they could step right into the scene." --ar 9:16