Twilight Sparkle - What just happened?

Someone requested a vector of Twilight from panel 20 of Twilight's First Day #5 in the comments. The comic is made mostly in Photoshop so it's bitmaps rather than vectors, but here anyway is the figure at its original 600dpi resolution (edited a little to make it a full body shot rather than being cut off by the panel border).

Update: And this has ended up on one of Equestria Daily's Drawfriend posts. ♫ I wasn't prepared for thi-i-is! ♫