Her folorn expression fits perfectly with the colours draining from her, it really gives a sense of being alone. You can see the feeling in her eyes and the posture is just right, well done.
Maybe to capture her full emotions, have the wings droop slightly? But you've still done an amazing job, this is really good, I wish there were more pices like this on Deviantart art that display a completely different side of a character, it works as its the complete opposite of how she usually is and again well done. I envy you. Going on kmy favourites.