Here is an interesting link to a full length figure/portrait painting session from a live model.
The approach is a bit different from Marks but you can see a lot of overlap.
the discussion and question/answers are informative.
they talk about drawing; from large shapes to small, using point, line and angle and seeing shapes. Similar to what mark talks about. However they start from gesture drawing.
they talk about light source, on the model and their canvas , which is 3200 kelvin and 4300?
they use a much wider palette.
They talk about how learning to paint is about learning to observe what you see.
They talking about painting what you see and about pushing colors and diverting from the observed subject.
There is a lot of talk about their school program but that’s interesting too.
All in all it’s an interesting and inspiring demonstration https://m.youtube.com/watch?v=xRBl20GhwII