The switch from frontal visible canopy to flat backdrop canopy is sudden and jarring. There should be a halfway. Also, add some variation in the forward canopy; as of right now it looks like you copied and pasted a whole bunch of the same circle of canopy across the entire top of the rock. Make varied circles of canopy, and then plaster them across to your heart's desire.
The waterfall should splash more on the big rock in it's way, or at least flow around it in some fashion. Right now the rock is just kind there, it looks as is if the water is flowing straight through it.
Beyond that, good work!