not bad. very interesting. If I may, just an idea, I feel that Twilight's glasses should be a different colour cause the colour you chose tends to clash with her other colours in a weird way, also I think they should maybe be more round and "geeky". Just some things that came into mind, well done by the way ^_^
I'm not very good at doing circular glasses, but you are right about the glasses color. To be honest I don't really know why I made her glasses yellow, but I did make her scrunchy is yellow so I guess that's the reason.