The brushes I use most often.
All the skin and hair brushes were made my me. The painting brushes are modifications of PS standard brushes. All brushes were created in Photoshop CS4, so they will not work with any version prior to that.
No credit needed, but it's appreciated. Free to use and modify.
How I personally use them:
The painting brushes I keep on 100% opacity and flow and use pen pressure EXCEPT for the two soft brushes which I keep at 40% flow.
The hair brushes are direction and need no special instruction. Just use them how you see fit.
The skin brushes I use by moving them in circles (usually with black or white) on a separate layer above the skin using the soft light or overlay blend modes and adjusting opacity as needed.