Don't shake your face - no one likes that! Then do some circling. My husband decided to eat me out the other night. Once I'm warmed up, I like spreading my legs wide and enjoying the hot wet lickage. My tip to all men is don't put a whole lot of saliva in her when you're licking her.
That drives me crazy.
The secret is to soften the tongue and work around the clitoral area rather than aggressively attacking the clit. That way he couldn't go wrong. The chin rubbing on the opening to the vagina adds to the pleasure. We have something like 5 times the nerve endings as men do "down there. The general entrance isn't all that sensitive and it won't really accomplish much.