You did an excellent job, and your work on the clouds is very obvious. The only thing I see "wrong" with it is in the foreground, the water/snow looks as if it is randomly running off the canvas. Without seeing the actual reference picture it is difficult to tell if this is supposed to be a small puddle and stream, or a patch of snow following the landscape, but it could probably be fixed easily with a little detail in front of it - literally like a couple of blades of grass - to "seat" it in the landscape better.

I hope my critique does not offend you in any way, and that you do not take it as insultive. I really do think it is great work. :)

I like this. ^^ Has a sort of abstract feel to it.

Tensik has voiced the same concerns for me, so I have nothing to add except that I love the clouds, and the river. The mountains look nice as well. ... Not entirely sure why the one all the way in the back looks a bit funky to me. :/

I guess that couldn't be helped though; I can barely draw. :p