A warm face for such a cold day. My only issue is wish her face was a bit brighter, she is basically darker than the rest of the photo so I keep seeing my eyes wander to the highlight on her coat etc. Maybe a tighter crop, or dodge/burn type of thing to help bring out her face, and maybe lower the focus on the snow around her.
I'd be willing to bet you were working on the layers challenge when you captured this beauty. I thought about this photo well after I voted on it last night. I got up this morning thinking about it... wondering why it left an impression on me. I came back to look at it again to see if I might be able to learn from it. Did you use on or off camera flash? Diffused?