I like it! I've just found a place that has a really cool waterfall that I had fun with last week. Now for my little critique...
I'd like to see that dark corner in the top left just a little bit lighter to see some more detail. On my monitor at home the green saturation looks about right. It looks like the green plants seem to get when they get lots of water. I get the feeling of relaxation, and wanting to go shoot more waterfalls from looking at this shot. Oh, and it does make me want to go ride Downieville since I've never been there