I took a break for a while, but have circled back to this. Some progress:

Naserian-08.jpg

Changes:

Added a large shrine
Darkened the points of interest to make them match the rest of the city a bit more closely
Added a stream as an outlet for the water
Put a Saturation adjustment layer over top of the trees and applied it with irregular shapes on the mask

Plus lots of shadow work, including more shadows for the walls, for taller buildings, on the dome of the Hall of Sky, for the understory beneath the jungle, and on the cliffs at the bottom. I'm still not happy with those cliffs. I think the rest of it is more or less how I want it, but the cliffs just aren't working quite right.