This is one of those pieces I love at first glance, then I stare at every part of it and then I see: The shadows are kind of missing, no shadow cast on the wolf from the girl and the shadow on the snow is simply way too simple. The snow fells rather hard beneath her. This escapes the first look because the focus is on her face, which is much higher above ground. One more thing, no snowfall in front of the figures.
It's awesome as it is, it would be great if you were to return to it and make these improvements and turn it a masterpiece.
Very creative concept, love the use of white as a color to characterize a piece, I need to do more of that myself...
Anyways, the woman looks nothing more than cut and paste of a render on a piece - if you could incorporate an aspect of shading (top right to bottom left is the apparent flow of light), it would make the woman flow much more realistically into the piece. Still, it's very nice, but the bottom edges of her dress are causing her to stand out a bit too much.