I draw cartoons/caricatures (examples here: http://www.smileecards.com) and have painted a few times, but I don't quite call myself a painter.
About teachers, I totally agree that good teachers earn the respect of the students by having high standard, calling students out on bad quality work. I once suspected a teacher only read the beginning and the end of essays, so I submitted a 4 page essay that contained a recipe for banana cake in the second and third pages; I received a B+!