Answer:
You have to find a modeling agency that has an "artists" division that includes hair stylists and makeup artists. Those are the ones that will actually offer you a contract and find you well paying jobs...just like they do with their models. In order to be considered you have to have a professional portfolio of work you've done. So if you are a makeup artist, you should have a portfolio with your best images printed out (8"x10") to display of models you have worked on during shoots. Having a traditional resume listing the clients you've worked for and your training is also helpful.
You can do an online search to find modeling agencies in your city/state. Their websites should list what divisions they represent.