I hear makeup is always essential, but why if my goal is to capture normal/real people?
1. As narrative filmmakers we rarely, if ever, capture real people. We capture actors' performances (people pretending to be normal/real people), as it's usually impossible/impractical to capture real people being "normal" because the very act of being observed/filmed changes their "normal" behaviour.
2. The practicalities/logistics of filming a performance takes a lot more time than a real/normal event and things can change in that time. The earth rotates, the light can change, the actors' behaviour and/or appearance can change, etc.
3. Even ignoring/bypassing the above two points, a camera is incapable of capturing reality anyway! At best, it captures a slice of one aspect of reality but even that is usually not the case because a camera's lens, sensor and processing does not respond to light or "see" the way our eyes/brain "see".
4. The previous points raises the questions of what is normal/real and how do we perceive reality, a good understanding of which can lead us to being able to create the illusion of a reality and hopefully creating a film which is engaging enough to allow an audience to escape from their actual reality of sitting at home/in a cinema looking at a screen. Additionally, for a hundred years or more, audiences expect more than "normal/real", which is mundane and therefore largely or at least partially uninteresting/boring.
The above facts are why most of the film crew/departments exist in the first place: The lighting dept, costume dept, sound design, production design, cinematography, picture and sound editors, graders, the music dept, etc., and of course MUA/s. There are occasions, individual shots or even whole scenes, where any one (or more) of these departments has little to do or aren't required at all, depending on the logistics and required reality/aesthetics of the shot. This also applies to the make-up dept!
G