Beautiful scenery. Honestly, well done ^^
The only thing i would consider to improve the scene would be that there appears to be no air. There is no wind at all. A simple, small moment of wind which causes the snowflakes to fall differently, more rapidly and to “dance” around a little might not take a long time to add, but may just give the scene a bit more of an effect. I mean, where outside has no wind for a whole minute, right?
Just my opinion, others may disagree as they think its perfect as it is. I just wanted to offer something potentially constructive 