Besides that the colour pallet, arms, facial features, and even the shading for the most-part are all on the money. I find the this biggest triumph in this deviation is that you nailed the most important part. This thoroughly expresses Fluttershy's meekness in a very tacit manner, and there's nothing in there to distract the viewer from getting that vibe.

In my opinion the biggest problem I have with this deviation is Fluttershy's torso. Her back in particular seems to protrude out a little too far, and the secants of the lines of her stomach above and below her arm in the foreground meet at rough angles. As a result it's hard to tell whether her torso is facing to the side or if her right shoulder is more outwards. Then again her hair might just be covering her left shoulder.