I really like the rendering on the trees and the swallows flitting about add a really nice effect. I think you have some great compositional elements here. I realize this sort of thing is highly subjective but I find the diagonal snowfield at the bottom very distracting. It just doesn't seem to fit in and I feel the image would be much stronger without it. The trees are quite powerful and can hold their own.
How I decided to frame this one was sort of intuitive, but what was running through my brain on some level is wanting to frame the water - snow in the foreground and the trees on the top of the frame. Just two layers seemed to be lacking something. I also wanted to put a limit on how large that body of water seemed by having something in the foreground.
I did try a crop of it the way you suggested, it's not bad that way, I just like this one more.