Anything above the neck and below shirtsleeves is a good guideline for the big E for starters, offensive/racist tats anywhere are a no no.
There are a few threads in the newbies forum about this have a skeg in there.
Anything that Ninja Stoker and/or SuperMario say regarding tats can be taken as the latest gen. They're Recruiters so they should know.
A complete set of Bum cheeks tatooed across your face with your mouth as the chocolate starfish visible only when your lips are puckered up. Finished off with a turd flopping down onto the chin and neck?