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.