Holy smoke...... I didn't know where to begin, either.... I jumped in by enlarging it first...
Ran a levels adjustment, then began rebuilding skin by using the healing brush set to pattern (created the pattern using Film Grain under Filters menu...
Also used Ro's De-Grunge twice...
After about 3 days of that.... hehehe..... I thought I detected teeth so I either brought them out or created them using dodge & burn method...
Lots of S&M.... I mean D&B.......
I copied and pasted tiny portions of lips to the missing parts of her lips ..... and same with hair (I wish I hadn't done that but I was getting tired)..
Created a background.... tinted it a sort of sepia color....
These are fun to work on because you really can't mess them up...
Beth