I love that the wings fade out at the ends while the base at the top is solid and bright! It's so fluid, and the movements are clearly balanced.
My only thing is that it is a little too soft in the middle. It's hard to stare at the picture long because my eyes want to travel away from the center. Remember that the center of a piece should be the focal point that complements the other details.
All in all, I love it! Your choice in colors gives it a cold and warm feeling, like your moving out of winter and into the spring time. It is very beautiful and almost mystical looking.
Last thing is that I love the yellow orbs in the background almost like sunlight in the darkness! It seems to be your favorite background and I love that about your style of work.