I really like the vertical framing. It's the only way to include that much foreground as well as the mountain in the back, unless you go at shorter focal lengths - or back off (which isn't always easy in the terrain you're shooting in here, in my experience...too much can get in the way, trees and stuff). As Derrel pointed out, the different planes is lovely, and naturally drags my eye into the scene. The trees is very nicely framed in upper right corner, IMO. The slightly curved diagonal is lovely and a classic element of landscape photography, and it's much easier to get these visually pleasing diagonals in a vertical orientation.
There is a very subtle CROSS (X) in here. My eyes goes across the scene, from lower right to upper left. Then, it goes from the trees in upper right and follows the curved diagonal I talked about. That makes an X. This basically means that you're used your space in the frame very efficiently - everything is of interest.
To conclude, great shot.