Artists impressions

I never cease to be amazed at how unflattering court drawings are. Is there a rule that if you are in court as the defendant that you have to be portrayed in the worst possible light? Or is the artist just reveals the accused's true inner self? Of course, it could be that you just look that way. I remember my brother once telling me that licence photos are as they are (haven't seen a flattering one yet) because that's the way you'll look when the police pull you over. Wonder what it is that makes someone embark on a career as a court artist- and how often do job openings come up?