For a simple piece, I don't think a critique was necessary. Then again, you might be the kind of artist who loves feedback from an honest artist. I'm not a brony but I am familiar with the fandom and the characters. First I'll start with the criticism...
The hood looks like jelly because of the highlight you put on the sleeve and ears and the roundness of all the edges. I see fabric being a little less highlighted but more crosshatched. The face looks a little plain. Where's her hair and tail? Details would help (not tremendous details but small ones). However, it reminds me of Winnie the Pooh, the carrot in pocket is a nice touch, and the shadowing on her fur (?) is great. The Vision is clear to me, but originality and technique could use some work.
You get 5 stars for Impact because even a non-brony like me couldn't resist the alluring adorableness of Fluttershy in a hoodie with bunny ears. And because you kept it simple, it's easy for anyone to look at this and get daaaw'd over time and again. Looking at the comments, the daaaw effect is spreading like a virus.
Considering your gallery, I see you are a talented one. I really have an admiration for your style because it's so delicate. I hope you plan on revisiting this piece; I might try it myself (with due credit to you).