Frame a lone figure sitting on a rooftop, their silhouette stark against the starry night sky. Use a telephoto lens, like the Nikon AF-S NIKKOR 70-200mm f/2.8E FL ED VR, to compress the perspective and emphasize the vastness of the city stretching below. A slow shutter speed will create light trails in the sky, adding a dynamic and peaceful element to the scene. For a 4K wallpaper, enhance the clarity and sharpness of the image, showcasing the intricate details of the city lights and the serene expression of the solitary figure.