A photo-realistic rendering of a rooftop garden with a serene view of a city skyline in the distance. the image is taken from a high angle, looking down on the garden. on the left side of the image, there is a concrete wall with purple flowers growing on it, and on the right side, there are lush green plants and wooden benches. the garden is filled with white pebbles, and the sky is clear and blue. in the background, the city skyline is visible, with tall buildings and a clear blue sky. the overall atmosphere is peaceful and tranquil, with a sense of tranquility and tranquility.