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

*   **Color Palette:** The original has a warmer, more varied color palette (beige, brown, hints of blue/purple from stained glass), while the synthetic version is dominated by lighter beige tones.
*   **Lighting:** The original shows stronger contrasts and shadows. The synthetic image appears much brighter and more evenly lit.
*   **Stained Glass:** The original showcases vibrant stained glass windows, whereas the synthetic image depicts plain arched windows.
*   **Foreground Details:** The original includes side aisles and additional architectural details in the foreground not present in the synthetic version.
*   **People:** A person is present in the original image but absent in the synthetic one.