This is my first ever vector, and my first contribution to the brony community! Please feel free to critique it or give helpful comments. I had some trouble with the tail and cutie mark, but the rest was pretty straightforward.
EDIT (March 13, 2012): I did a lot of reworking of this using very helpful suggestions from MLPVectors on reddit, mostly with Twilight's mouth, nose, and eyes. I also did a little bit of recoloring and fixed some strokes. I hope you like it and please feel free to critique! Also, I've posted my svg image here: [link]