To get the "perfect" mask, use Pshop and the W keyboard you shoudl have selected QUICK SELECTION TOOL, then press Left buton on mouse and go over areas that need masked, it uses soem AI stuff so can do a lot of nasty work done very quick, and its great on hairs.. just ry it, in few minutes get it in hands....
SZelect sthe size of the brus somewhere between 10-40 pix for best results....