Some people will think I?m crazy but I duplicate the picture... bring the opacity and lock the top layer with the bottom layer, erase the entire background on the top layer and draw the hair back in using a 1 pixel brush and fade the ends.
At first its hard and takes more time then its worth but as time goes on you will find that it takes no time at all and your work will come out 10 times better then it used to.
Opps I just gave away one of my secrets