I gotta say, you have a nice style when it comes to drawing ponies, and what you've created here... it looks great! Its clean (your choice of colors are great!), I like all of the yellows and Derpy's pose.
If it helps to calm your inner self, try to imagine the wings in the way you figure they should be compared to how the pic is. A design choice that overall is more befitting of the picture rather than being realistic.