You want to try and bring a character to life in an honest a way as you possibly can. It doesn't matter whether he's a doctor, an actor, a car salesman or a captain of a starship. If you can bring truth and honesty to that character, then your audience will believe you.
“You know, let's put it this way, if all the people in Hollywood who have had plastic surgery, if they went on vacation, there wouldn't be a person left in town.”