Couple things to consider with water shots.....
Use a tripod, this will eliminate the lack of clarity in the rocks and the overall picture being out of focus.
Secondly, long exposures are cool when shooting water shots, however this one is way too long. If your going for the "fuzzy" water look, remember less is more. You can get the same effect with a much high shutter speed....especially with a tripod.
just my opinion