The primary scenic element here is the backdrop. Most of the staging yard tracks (all two of them!) will be screened from view by a line of trees, bushes etc... a modified version of "Screened Staging" I used on a prior layout.
Yesterday I dug out the backdrop paints and got a start on the backdrop behind the staging yard.
At first I didn't like how "flat" the mid ground (tan) hill looked. So I experimented with adding some additional texture - you can see it if you look closely at the center of the hill in the photo below. Now I have to add that texturing to the rest of the hillside.