For us to buy the story, we need to believe that there is actually a robot under Schwarzenegger’s skin, or that Jennifer Lopez has bruises on her face, or whatever.The best makeup artists are those whose work you never really notice. As an audience member, assuming all other elements are met (acting, writing, directing), it becomes that much easier for you to become invested in the characters on the screen when the makeup is done well. It is true artistry.