backgrounds can be either vacant of much of anything like this one yet still be wildly detailed if you wanted it that way, (just with slashes of yellow ochers, russet reds, blues and from white to gray in the rocks. (blue rocks have a lot of silver content. . In Lawrence of Arabia the desert was pretty much the same in the background, but up closer it is more detailed. Dune, another desert movie also had a lot of detail even in boring rock formations were heavily detailed, but only close up.
I hope that helps. Everything I do in the background is out of focus to direct the eye to one part of the picture, and there follows the point of focus of what is in detail that the eye has been directed to. This does not have to be a point, but can be a pan or arc of detail, but not too big, not all of us are Anhes.