Sorry I find this subjectless, it looks like you slowed the shutter to get a flow to it, but the grass and the rest of the green overwhelms the picture. A better angle or closer to the stream would have get the river flow better.
It's a good idea to use the entire allowed 640 pixels on one side. A larger image size can sometimes make it appear more dynamic. I think you captured the water beautifully (!!) - its spray looks so smooth and I like all the greenery surrounding it. Also to make the image more dynamic, you might consider cropping a bet out of the left, so the waterfall is positioned more in the left third. Nice job - and I hope you don't mind my comments.
I'll assume the progress here is that of the water. If so, it needs to be a bit more of the focus of the shot - the way it is now the foreground seems to be the focus. Lovely shades of green captured here.