Prompt: Generate a detailed photorealistic image with a dark blue balloon dog resembling Jeff Koons' style. In the foreground, place a billboard with precise dimensions (e.g., width=300px, height=200px) in front of the balloon dog. The billboard must prominently display the text 'POLITECNICO DI MILANO' in capital letters and be clearly visible. Ensure that the iconic Duomo in Milan is in the background, providing a realistic and aesthetically pleasing scene. Pay close attention to detail, including lighting and shadows, to create a convincing and polished image