In our association there has not been any directive for us to be clean shaven. Some of the officials in our assoc. have facial hair, most don't. I have heard that if you want to move above the HS level then it is best to go with the clean shaven look. Which makes sense, because you really don't see many of the TV guys with a beard.
That said, I went clean the first year and have worn a goat for the past two years (very short-two to three days growth). I would like to think that the coaches don't argue many calls with me any more because I have become a better official. But then again, the goat makes me look like I'm already angry about something and not going to take much crap. The stink eye has a lot more of an effect.
I try to smile a lot.