Hi Jonathan, I just spotted this. What a beautiful painting! Congratulations on this sensitive, painterly work. (You're right, color really is secondary to values and drawing, but your color here looks wonderful. I just discovered cobalt violet also.)
If this is the first time you did a three hour demo, I hate you.
Next time you do this I would love to see progress photos.
Did you talk to the crowd as you worked? I think it is tough to answer the crowd's questions and still come up with a good painting - takes a lot of practice.
Again, what a lovely painting!