I have known a vast quantity of nonsense talked about bad men not looking you in the face. Don't trust that conventional idea. Dishonesty will stare honesty out of countenance, any day in the week, if there is anything to be got by it.
All I would tell people is to hold on to what was individual about themselves, not to allow their ambition for success to cause them to try to imitate the success of others. You've got to find it on your own terms.