I appreciate all the replies, and will try to explain whatâs going on here.
Between the trestle and the finished backdrop, the expansion puts a two level, 13 inch wide staging yard. That gets covered up with a ridgeline coming in from the left, which dies at the edge of the riverâs upper section. Just behind the free span of the trestle there will be a waterfall, maybe twice as tall as the bridge deck.
So, to the left of the bridge, the terrain starts at upper level waterâs edge and slopes uphill to the left. To the right of the bridge, thereâs a ridgeline all the way back at the backdrop line, again starting at waterâs edge and rising to the right. Above the waterfall, the river turns left and disappears behind the left ridge, with a smaller creek coming down the wash at the right.
Essentially, the backdrop will sit behind both ridgelines, but they come down to form a V about where the present terrain does, only higher, so the effect will be similar, just further back. I have literally thousands of high res digital images from Colorado, so the purpose of this thread was to figure out whatâŚtypeâŚof backdrop to use, not necessarily which exact picture.
Different âtypesâ include wider, open valleys leading to shorter mountains, wider open valleys leading to taller mountains, and continuing the foreground mountains on up higher with the backdrop.
My opinion matches most of those given here, the wider valley opens up the space, and the taller mountains and pretty sky make a nice scene. That image works okay from some other angles:

âŚbut there are also problems from some angles too, namely from head on, where we have a âdisappearing riverâ:

I think the two new ridges and bend in the river above the falls will deal with this problem, but time will tell. Itâs not too ear