Have had horses on the brain for a while. Felt like drawing some headcanon wingalings for these three.

Twilight's wings I based off a peacock. They're more elliptical in shape, giving her fast takeoff and good maneuverability at the expense of speed and constant need for flapping.
Rainbow Dash's are a mix of falcon and vulture. Fast wings good for passive soaring and divebombing. Pretty much the perfect mix to make her an excellent flyer.
Fluttershy's wings are based off an albatross. Long, thin soaring wings that are good for long distance flights so long as conditions are favorable. Otherwise her's are so big they actually make it a bit hard to fly.

That's all for now~ I -might- do the other princesses? I'm not sure yet.