Awesome! First I am partial to B&W photos but this is great. I really like the capture of the thick clouds enveloping the mountains and the thin and wispy mist flowing around the trees in the foreground.
My only criticism is the dark clouds at the top of the photo distract the viewer from the rest of the photo.
I agree I tried both crops and at first I thought the square crop was better but know I am leaning more towards the landscape crop like you did....this is how I did it