A couple people have mentioned the weather. My money says there are two snow overlays in this. One with the smaller flakes, and one with huge fakes that are heavily blurred. Either that, or it magically stopped snowing in front of her face and hair, but snowed just as heavily down below, in front of her coat.
Wow; you managed to pull this one off wonderfully. Falling snow captures like this (seen a few but not many) are hit or miss; you definitely hit this one. Thanks for sharing. I suppose it helps to have a pretty model. lol