I would include your experience with a variety of people in under your job descriptions and talk about your knowledge of MAC. For example for an objective you could say something along the lines of "To pursue my passion for makeup artistry while utilizing my knowledge of MAC product." Study up on products and pricing so that you can back that statement up.
Under your job description you might want to throw in something like "Provided personal assistance to patients in a high-stress enviroment."
I don't know, those could be worded a lot better but I'm sleepy and not in resume-writing mode. You kind of see where you can throw in tid-bits that apply to the job.
Thesaurus.com is your friend while upgrading a resume!