The eyes and mouth are the most expressive features of most faces, for example. Highlight so that when they move, folks notice. Preparing the Face Always wash and dry the face thoroughly before applying makeup. Men should shave thoroughly, even for tramp and hobo characters. Women should remove all traces of commercial cosmetics from their face.
Some folks are concerned about wearing contact lenses while in character.
I have worn a variety of lenses with my character since the early '80s with very few problems. Keep powder out of the eyes. You can do it with care. This makes the makeup a stain hazard. Whenever you travel to a convention or plan on making up away from home, carry your own makeup towels.