CD is on the mark. Makeup needs to be done correctly. Providers needs to find makeup with the correct tone to their skin and makeup that don't break them out. I'm probably talking to the choir.
As the old adage goes, it takes money to make money. Some needs more makeup than others.
I remember, I met this one provider and she was dressed to the nines, makeup, nails, hair. She looked like she was ready to go out on a night on the town. I was blown away. Needless to say, we had a great time and I see her whenever I can.
Yes, I also agree on smiling. I want to add a playful attitude helps a bunch. Of course, it is all YMMV and the chemistry between both persons.