For beauty pros with plenty of experience under their belts, they could do the job with their eyes closed. Thats why, "every once in a while, it's okay to take your hair down and have a glass of rosé with a client — that's the nature of the business," says Sir John , the genius makeup artist behind Beyoncé and Joan Smalls' looks. "It’s also helpful to surround yourself with people who have that same carefree attitude."