I remember once I reached the intermediate Ballet level there was a requirement to wear makeup. I showed up to ballet without any make up on and my teacher pulled me aside and said "don't ever show up without mascara and lip gloss on to my class again" and that's when I started wearing make up.
Since then just about everyday I've done my make before class. I don't have anything against make up, I've actually found that makeup sometimes helps me feel better and unstoppable in dance class.