I love the snowy background...The slightly dark sky in the back is very fitting for a snow scene, and then I like how you did the snow on the ground and on the snowman. Seeing bluish tones highlighting the snow is pretty standard, but I like how you mixed in some red with it, too. : ) I dunno, I just thought it looked neat.
And of course the girl looks amazing @_@ I really like her outfit, for one...Her coat looks quite warm...you depicted it very nicely, clearly showing that it's made of thick and heavy fabric. I like the furry parts on her shoulders...Again, you did a great job of illustrating the texture of it. And then her hat is so. cute. I love it! XD
I like her pose, with her arms stretched up as she's looking happily at the snow. Her hair is really pretty, too, and looks very...erm, full? Vibrant? Sorry, I don't know what kind of words to use to describe hair, but it looks pretty lively here.
And then her face...again, amazing. Her eyes, her mouth, her nose...It all looks great. The shape of her face is great, and the shadows and the rosy spots give it just enough dimension to make the face look pretty real.
That asside, excelent proportions, awsome colors, beautiful gradation... nothing much else I can say really. The brightness of this one caught my attention amongst all the elegantly done work in your gallery.