I can't see there being a problem with make up. As long as it doesn't look like a 4 year old has drawn on your face with crayons or you look plaster it on like a 16 year old girl, you'll be fine.
It's just common sense with grooming. Dress and groom like you mean business and you'll be fine.
If you can't imagine a female lawyer with pink hair, chances are it's not allowed for a pilot either.