Right now, it looks good there is a level of detail and the elevation gives the scene that realism look. You don’t want to overdo the details if you plan on adding objects and props; i would recommend adding things that fits the design rather throwing random items that doesn’t scream desert theme regardless.
I think the terrain would be more interesting if more small foliage was placed throughout the landscape. There is little details around the area, flat surface and hills to give the scene a more realistic feel. Why not place dried trees with dusty rocks just to give the terrain a little more depth. Some different shapes of rocks/trees would also make it much more realistic.
Overall, I just recommend adding small objects, details, and making vegetation that’ll fit the scene desert places don’t feature much details it just needs small props I’ll look at real life images to gather different ideas and see which ones look goo to you. Otherwise, it looks good.