Help: What MAKEUP topic can I write about for my makeup thesis (eg. permanent makeup)?

I have to write a 4000 word makeup thesis for my makeup cl. I'm just not sure about a topic. It can be about ANYTHING regarding makeup...permanent makeup, a makeup brand (eg. Loreal), history of makeup, makeup psychology etc. Does anyone have any other ideas for topics, or any ideas on what I can do wih the topics I've already mentioned?