WOW!
As a favorite teacher would say, "juicy"! I just reread David Leffel's "Oil Painting Secrets from a Master". Your style reminds me of his work, you may want to check it out to fine tune an already incredible piece.
The only thing I would look again at would be your eyes. A little more clarity on the light area side perhaps. Also, watch for the tendency to make them too 'pointy' at the edges, or almondy.
Truly, a great painting. Congratulations.