If you are looking at girl, but you think she wears too much makeup, casually say what you like, if she adjusts, then maybe see if she is worth dating (courting, I don't know what people want to call it.) If she doesn't, move on to someone else.
Yeah, just because someone has it on ... who knows what her motivation was? Perhaps she just thought she needed to put it on so as not to be ignored, but in reality hated having to wear it. That's the kind of thing to be careful about judging. You might end up ruling out someone who would have made a terrific wife, due to some snap mistaken judgment.