Twilight Sparkle, the Princess of Sass

Half a year ago I posted on my Tumblr an Alicorn Twilight sketch I did in April 2012. (Here's the [link], if you don't believe me or are just curious, I don't know)

And, since Princess Sparkle is now canon, I decided to finish that piece (and try a new style). Plus, I always liked this sassy look on her face. Just look at her.
I modified a bit this silly dress, because it's just plain ugly and I don't know what were they thinking when making it. Probably "whatever, let's just slap some pink and bows on it" or something.