You did an excellent job! This has excellent dimension and the focal point (the skull) really pops. The only improvement I would recommend is using some more value in the bolder flowers surrounding the wings. They don't seem to mesh all the way, and stand in contrast to the intricacy of the rest of the wings and "face". Another great point of this work is the colors you use to accent the white bits, although I would recommend drawing just a few more flowers in the wings themselves. Keep up the good work!
Thanks for the comments. The more detailed flowers in the wings were specific to the request. You're absolutely right about the decorative flowers surrounding it. She wanted filigree type stuff. I couldn't quit nail the look of that. I picked the pastel colors to mirror those of the design work on the skull, but you're right, it just doesn't mesh as well as I wanted.