Hi John,
You have an excellent rendering of the child's features. The only killjoy here is in the values (if this photo of the painting is close to the actual painting itself)
I'm especially gripped by the values on the nose, when i thought that the values of the tip of the nose, ought to be higher than the forehead. So what i can suggest is to tone down that of the forehead.
The same goes for the value of the neck, because that site marks the transition from light to dark. Michele recommended this site for another thread, but i thought it may also help you here. Keep up the good work, John!
http://www.hongminzou.com/