This is a very nice scene but lacks a central focal point. Adding something to the foreground for the viewer to focus on would add considerble interest to this composition.
Love the sky,lighting, mountains and tree's. My only critisism is the forgroud..there is too much going on making it a tad messy imo. very nice other than that.
Horizons on the halfway mark are difficult to get away with. Choose a really strong foreground object (rock, tussock of grass, tree stump) then move the horizon up to 2/3. OR if the sky is really powerful then move the horizon down to 1/3