Nicely done! If I was going to be picky I'd tone down that white 'knob' on the tree branch at the upper right and remove the branch(?) that is hanging below the rock into the water at the bottom of the frame. But overall, great image.
Thanks everyone for the comments.
John, Mike: the white 'knob' and the highly saturated leaf on the same trunk came out as a result of toning down the trunk (see my post above). Thanks for pointing this out; fortunately, it's easy to "fix". Jason, Lisa: thanks for your observation. I guess it doesn't help that the foreground in the picture contains some of the lightest tones (the flowing white water). I'll try reducing the contrast between the flowing water and the adjacent base of the tree trunk (see whether that helps).