I was thinking it would look good cropped too. Although I was thinking more of the top than the bottom. I like the frosty patch in the foreground, it draws your attention to the fact that the shot goes from your feet, down through the trees and out to the horizon.
I think it makes a great square image, so much so that I had a little play. I hope you don't mind but it was easier to do a rough version of how I saw it than try to explain. Of course I'll get rid of the link if you'd rather I hadn't.
http://dazzajl.fotopic.net/p26270140.html