First of all nice choice in vectors, using Twilight's pose from the theme song. And secondly I like the choices of purples you used. You have the color that represents everyone's favorite unicorn but it's not so much purple that it all clashes and or unneccessarily blends with Twilight. It's fitting but it's not smothering. I also like how you have the spotlight on Twilight. Though Celestia didn't take time for her at the Gala, all of the fans here will take time for Twilight Sparkle. The cloud mist in the background is a nice touch as well. Nice job.