The style used here REALLY reminds me of the classic Disney style, and I really like it. This could probably how I could imagine Anna if she was animated in 2D.
The colors on the background look especially nice, but it kind of looks strange how the trees are nearly perfectly circular. Unless this was aiming for an abstract sort of style, but I really don't think this piece is aiming for anything abstract.
But on Anna herself, I can't find much flaws on her. I really like the choice on the colors of the lineart because like I said before, she does look a bit like some clip art of the classic Disney princesses. And did I also mention Anna's adorable? I also like the snowflakes all over the place.
I won't lie this is the first critique I've ever written that I have very little few flaws to point out. Just keep up the good work.
I think it is a very good piece. Like the previous critique it looks like the traditional 2D Disney Princesses. I only thing I really have to critique is that I think her hair is a little too orange/yellow. In the movie her hair is more brown, or auburn in color. Plus the white streak is missing don her braid on the left (her right) side. I know I being critical of the character and not so much the drawing. However, with that being said, the drawing itself is flawless. The style, the texture, the background, and the colors are great. The colors of the background mesh and seam perfectly together and do not take away from Anna at all. I also liked how the trees in the background, the branches were white and (I assume) covered in snow. It is a really good job and I like that the snowflakes actually look like snowflakes, not stars as on some cases. Keep up the good work as usual!