is to make a new layer,
7/2/2011 10:07:02 PM divans Austin then to take a small soft brush
7/2/2011 10:07:09 PM divans Austin and brush white over the part u want lighted
7/2/2011 10:07:11 PM divans Austin then put thato n overlay
7/2/2011 10:07:15 PM divans Austin and lower opacity
My friend helped me do this so i just copy+ pasted our convo.
I hope this is what you are asking for.