Here's a breakdown of the key differences between the two images:

*   **Number of Birds:** The original has only 3 distinct birds, while the synthetic image depicts a flock of many more birds.
*   **Mountain Range Detail:** The synthetic image shows a much more detailed and complex mountain range with multiple peaks and ridges compared to the simpler, less defined range in the original.
*   **Foreground Detail:** The original features a blurred, rocky foreground which is absent in the synthetic version.
*   **Sky Clarity:** The synthetic image has a more uniform, brighter sky than the slightly darker, cloudier sky in the original.