I fancy working on the shewolf stare! -
yes! that can be very disconcerting - I had a tutor who did it to perfection, leaving you crawling into a deeper and deeper hole of mindless explanations and just wanting to die!
some of the other stuff may be a little too confrontational - thought tempting
yes Cav, the spontaneity ... exactly the problem.
eyebrow raising ...mmmm .... could work on some people quite well
Yes, Osso I think 'so, I see you know nothing about painting' with a disarming smile might help - they won't be quite sure how much they've been insulted!