Be grateful for imperfect models and clients. I get so irritated by MUA's complaining about models or clients who do not have perfect skin or eyebrows etc. If people were perfect what would we do for a living? When someone apologizes in my chair for their breakout, chapped lips, whacked brows etc. I always tell them to stop, it's job security for me. I can fix it! While models should be prepared there is only so much they can do for hormones or overworked skin. On set if their skin is broken out, puffy or tired it's my job to inform the photographer, director etc. about the situation so lighting can be adjusted to compensate. It's not my job to scold the talent, thereby making them insecure or upset so they do not perform well and the whole shoot is a loss. Be grateful for imperfection, it keeps you employed. And if you can't handle the situation like a professional, it's time to look for another career.