Agree with Jim. The rocks in front of the main falls are excellently placed. The near rock at the right could be burned in, especially at the top. As it is, the eye travels too quickly to that rock. I think I'd also darken the foliage at the lower middle to left. It is a bit too bright, again leading the eye away from the falls. That bit of fallen tree (?) in front of the middle rocks is somewhat distracting. I've found that making such things the slightest bit fuzzy does wonders. Nice work.