The depth of the shadow and highlights are amazing. I really like the color you chose. It gives her a mystical feel. Which is appropriate for a fairy.
The proportions are great, she looks lifelike. I have this feeling like she has this darker side that is just waiting to surface. And that makes the piece work with the purple coloring you chose.
The one thing that I don't understand completely is why there's a feather and flowers coming out of her head. I like the placement, it makes me ponder why. But, i think that it would have been better placed on the other side of her head.
The fact that this is a painting.. WOW. I love the colours, and the smoothness of the skin and the hair and feathers. The details are amazing and I LOVE your art! wish I had this much skill with a brush