Interesting observations, Chris! These self-evident courtesies are often overlooked in class.
Here's a question: How important is position?
I go back to a Greenwich Art Society portrait class this evening with a new (to me) teacher, Enzo Russo. He recommends keeping the easel positioned to the right of your view of the model (assuming you paint with your right). Logistical considerations you mention above do not always permit such luxury.
I hold the model in my mind long after I look. That is what I paint. That is why I look for a spot which allows me to see the design on the model over all else.
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