Little late to the thread. I do a fair bit of photography, including the odd fun shoot. If you're not familiar with doing makeup for a photoshoot consider their hair and makeup person, or give it a Google. Some styles can look very different to a camera, especially if strobes (flash) are used. Have a great time with your shoot. I've seen some amazing pictures with Provoke. They're very good.
If you are planning to do a serious shoot, it is worth the hair and makeup. They know how to make you look stunning and for my wife it was a wonderful experience just having that done