It was mentioned about building 'back to front.' Remember the trees painted on the backdrop earlier? Now see what we have. First you see most of the dorky looking trees I painted are covered up. They are there, but are not the focal point of the scene. They just give an idea of trees in the distance.
Also we see that we don't see the divide between the rock cliff and the backdrop. Good modeling requires the gap or joint of the plaster cloth and back drop be completely covered up. Super Trees bushes do the job nicely. The distance from the track to the backdrop is so small that the cliff area is difficult to pull off, but I think this came out well. Sharp viewers will notice the front hill and tree area is more sparse and is already showing the transition to a drier climate region even though all this modeling takes place in about 1 foot.
As with the real outdoors. Don't scrimp on adding scenery effects. Especially narrow area next to the backboard. Jim