The wind (or something) that makes the green's blur is really unfortunate.
Even if you use a tripod, unless it is a real stable one, you may have to use a timer to take the picture to allow the tripod time to stop shaking after you press the button.
Also, if you could use a straightening tool to make the water flat that would be good.
Finally, I'd make the waterfall in the right side of the picture, not centered (think rule of thirds). With the water leading away it gives you some sense of direction (where is the water going??)
The other comments about the blown highlights are dead on.
Good luck!
Mike