This is just me, but I have found photographic backdrops getting in the way. They command too much attention, but not in a good way. The problem is that the apparent lie of the land doesn’t match up with the layout’s next to it, and the abrupt shift takes place along the back of the benchwork. Layout flat, backdrop forest tilted. Blechh!!
To me, and just like the fascia closet to you, backdrops are fillers, not part of the rail experience or of the track system itself. But, having said that, I have seem amazingly well done images, with the camera lens set properly low (head height in HO) and an entirely convincing background imparted by a carefully chosen, and well mounted, photographic backdrop. It can be done, but generally isn’t.
Look for images of expanses where the guy didn’t scramble up a knoll to get a better view. You want some trees in the way, little rising ground as the distance from the camera increases, and no ladders or hilltops under the camera. The far hills and buildings are great, just not at the top of a banked field with a canted river.