What Makes a Good Art Teacher?

What are the characteristics of a good art teacher?

Most of us have had a teacher who at some point in our lives has a made a very real difference to who we are today.

What are the attributes of a good art teacher? What makes them somebody who can make a real difference in how their students develop and the art they make?

Do you think one or more of the following factors might be important?

active artist; produces good art
very knowledgeable ( art history / specific media)
good at demonstrations / explaining techniques
tightly focused classes (beginners; masterclass etc)
adapts teaching to student's learning style
enthusiastic/passionate about art
strong belief: everybody can make art/draw/paint
promotes originality/creativity (not just copying)
promotes learning and self-evaluation
sets appropriate / challenging goals
encouraging - provides constructive feedback
effective communicator

Most people will have very different experiences of art teaching. What's important is what YOU think makes a good art teacher.

So, what do you think?