Anything Goes : Make-up Question by Debbie Castanha

I have a female character who goes incognito for a few months. This character is a recognizable actress who is trying to prepare for a role and does not want to be recognized . I wonder where I could go/ who might be able to give me some advice on what actresses would do beside the obvious (hair styles and glasses.) Semi-permanent make up beauty marks? freckles? I have no idea. Should I put this in cinematography? What is really done in these cases in Hollywood (for female actresses)? Thanks for your advice.