This is a very well composed shot. But there seems to be too much purple in the water. Also I think the shadows are a bit too dark. I would LOVE to see this image after you applied this tutorial...
//www.dpchallenge.com/tutorial.php?TUTORIAL_ID=20
Nice comp, but the water is too overexposed as I'm sure you've already been told! For these kind of shots it's good to have a neutral density filter to increase the exposure without blowing out the highlights...
REALLY nice shot. Maybe a bit too much dodging or exposure or something (I can't tell) on the waterfall. Composition, everything else superb! Nice shot.