Nice
Love the background, great use of color in this as well.
My main problem with this piece is the anatomy. The breasts are too high on the rib cage. Even with a push up bra breasts aren't that high on the rib cage. The mid section also leaves something to be desired with the off centered belly button. The lips on the face also appear to be too low. Either lengthen the nose or bring up the lips and shorten the whole face.
You have a great understanding of light and color so I don't understand why you are outlining it all in black- it distracts from all the great color and painting work you did. You have great potential, keep at it! I hope this helps :)