One option can be working in R&D or Manufacturing for a cosmetics company. Depending on what aspects of make up you are interested in, another option could be in animation or VR. Another direction could be working for pigment or scent companies.
I'm not sure science and doing makeup have anything in common, but there's definitely a science of makeup--several of them, in fact: organic and inorganic chemistry, biochemistry, and materials science all play a part in the creation and testing of potential makeup ingredients or of entire makeup formulations. Nanomaterials and nanostructures are responsible for such things as iridescence in a butterfly's wings, absolutely jet-black materials, hydrophobic (water-resistant) materials, etc., and will undoubtedly play a much bigger role in the future. At the same time, there are all sorts of questions about their interactions with human skin, lips, eyes, and noses, not to mention with each other, with clothing, with cleaning products, and even with insects (think mosquitoes), microbes, and solar radiation.
I'm sure there are other angles I'm overlooking, btw. I'm speaking mostly on the basis of a background in physics (quite a while back) and more recent, general-purpose science updates/awareness via Science News and various online sources.
Renata Lynette’s Answer
Here are two sites that will give you much information regarding education to become a cosmetic scientist:
Here is a link to a professional organization to which many people in this career area belong:
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You Can become a Cosmetic Chemist. Please go through the link below:
Someone has already mentioned R&D (research and development), which is a large part of any successful cosmetic company today. This said, you can also work with laboratories that handle clinical testing for many cosmetics companies. This is a great behind-the-scenes job that will give you in-depth knowledge about product ingredients and testing methods.