Since the light is coming from two opposite places with equal intensity, I felt a little thrown off. But it gives off this feeling of not having enough light but having enough light to see. I have to applaud you on the scenery, because it really does match with the changelings. We've never seen the changeling hives (I don't think) so I know all of the background is coming from you.
The coolest part of this piece is how the green light makes everything green being hit by it glow. I like the idea of all the green on her body glowing, even her makeup.
Wait, is that Derpy? She looks suprisingly happy. Does she not care at all she has holes in her hooves and now has to feed of love? I'm sure it's fine thought, this is Derpy after all so mabey it's just a spell for one day and Derpy just wants to know what it's like to....... *looks closer at the art work and sees Twilights Cutie mark* OH SHIT! DONT TELL ME FLUTTERSHY IS CAPTURED TWO!