The clouds kinda look they're on fire to me lol. Also, the blue background makes them really stick out, maybe try a pinkish background instead of blue? Or more purples on the clouds instead of reds. I like the way you made them though, they're cute :) Nice work.
I like the way you did the clouds here. The shading on both the clouds and the snowman are very nice.
Cute! Nice to see some snow on the tree too =]