not sure what it is about this picture...if it is over done with the Noise Filter or not enough sharpening...whatever it is makes this duller than I think it actually was...
Had to stop and comment on this on and explain why I gave it just a 6. This is a gorgeous, not seen very often shot. For me though, it is all one colour. I know that sounds odd, but the tone of grey is consistent all the way through this. It is rather a flat shot. It may have been improved slightly with some dodge and burn, a little curves, just to get some highlights and shadows in it, it needs some sparkles in the snow, the snow all looks grey, you have an amazing shot here but definition would have helped it.
A wonderful exposure of a winter wonderland! There's a lot going on here. You might try moving in closer and isolating a particular section of the falls to simplify the composition and draw more attention to the subject.