The foreground rocks really adds to the whole scene, I might even say that they're the ones that makes this shot as good as it is. Besides the very smooth and well captured bash of water there hitting the rocks. Tho I'm a bit doubtful the effect of the bashing water really adds to the scene or not. My thought is that the scene itself isn't dark enough to have that heavy action.
That aside, it's a great photo with good composition, nice lines.