"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, so it should closely resemble reality in every detail. The alley should feature brick walls, windows, pipes, and scattered objects like trash cans and debris, showcasing traces of urban life. A dim yet bright light source illuminates parts of the alley, enhancing the atmosphere. Additionally, a UFO appears in the sky, casting light down onto the urban alleyway. The presence of the UFO and its light adds a mysterious and mystical ambiance, emphasizing immersion and realism to such an extent that viewers feel as though they could step right into the scene." --ar 9:16