This picture is absolutely beautiful, with the detail in the hair and the beautiful detail in the clothing and shading. Everything seems proportional to everything else, and the shading is amazing. The detail in the wing is really nicely made, too, but it would have looked a little bit better if the wing was a little bit larger. That is my own opinion.
Besides that, this picture is all well-done and beautiful. The eyes are really pretty and well done, and the flowers in the back are also really well drawn and beautifully shaded somewhat. This is an incredible and amazing piece of artwork you've done.
THAT DETAIL. It's so freaking beautiful <3 aha and I know that feeling, in class i would be drawing and you feel like you just HAVE TO finish it and add some detail XD The wings are gorgeous whenever I try, its always tuning out simple because sometimes I get confused about all the feathers ahah. I also love how you drew her clothes, it's so pretty X3