Looks like Twilight has mastered all there is to know about magic and has become the Mage Consul of Canterlot? Though she has a somewhat sad expression on her face, I guess her royal duties tend to keep her from her from her friends in Ponyville.
Goodness. How, exactly, do you do all this? The background, the magic, Twilight herself... You are so talented. How, exactly, do you get that detailed effect for her? If you don't mind me asking, of course. Great work.
Um... I just add shadow all over her, and erase the parts I don't need. Then add some different color to it to make it stand out more. The magic was just a solid color blurred, with an airbrush effect over it. That explanation sucked. I don't really know what to say... XD
I actually had different thoughts going through my head as I drew this. Magical entrapment. Spiritual projection. (Good call Estavin) Definitive journey. False beings. But I didn't decided on one. I'll let others decided for themselves what they think is going on.