Fluttershy isn't sure about Angel

Very good work! The only issues I see are small ones. One of the inner tail lines starts and ends a bit thick and the other starts out a bit too flat, given the nature of Fluttershy's tail it should really start at more of a curve.
Her wing is a bit off as well, not being as consistently thick in a few places at the tips of the feathers.
On the top bit of her hair the hair lines gradually get thicker one after the other. At the bottom part of her hair the lines are just a little too thick in general, approaching close to the same thickness as the hair strokes.
The background is really good and looks natural. Good gradients. The overall image is cute, funny, and of best pony. 8 hours well spent.