I'm working on the main .psd file for this shot now - finally get to see it come together after days of tedious tree making. I've only scaled and placed the trees - I still have to desaturate them and lower the contrast to impart the illusion of distance.

I'm going to wait until I get most of the trees and the sky in place to do that. From this point of view, the light is coming directly towards the viewer - i.e. the trees are going to need to look different from the previous composite, which had lighting from the side.