You've used just the right shutter speed to get some motion blur in the waterfalls yet freeze capture the texture of the water surface. But the strong lines in the image lead the viewer's eye out of the photo, leaving him unsatisfied, wondering what's just beyond the border.
I really like the composition of this image. I think it would benefit from some post processing - if the water were darker, the marble tiles more saturated, and everthing more punchy with global contrast with USM, it would be great. Still an 8 for me.
Nice composition!
Good attention to detail with verticles actually being verticle.
I like the sense of perspective as the wall moves out to the left.
The image seems a little flat, but I'm not sure why, very minor. (maybe lack of shadow)