Exposure looks good, I think you just need to work on the composition of the image. It could do with something in the foreground, but the rock that is there at the moment looks like its trying to sneak into shot rather than being framed there. It also gives the image a slightly unbalanced feeling. So if you get a chance to go to this location again try and find something of interest to stick in the front of the image, for example more of the rock in the bottom left.
Another alternative is try framing tighter and just have the falls and not include any or very little of the pool.
just my thoughts, Trev