Initial impression: Hmm how do you find fault in such a beautiful picture?
Technical: Light is just stunning, composition is beautiful, dof works well...hmmm...Aha, found a couple of teeny little things (trees?) on the cliffhead on the right that could have been cloned out.
Artistic: That amazing infinite sky and almost-magical light screams Iceland to me. How else could you do so little post-processing and have it look so good? Love it.
Overall: I really don't know what else to say. A top 10 finish in a Free Study is nothing to sneeze at, you could have easily ribboned with this shot.
I must admit I'm not a big fan of fluffy water shots, but this one is having a very different effect on me. It's not the waterfalls that are drawing me in, it's that translucent beach glass aqua that seems to move and undulate right before my eyes...expanding...contracting...I can't stop looking at it.