John,
We should really start a thread on drawing portraits for friends. The real hazard is that they might not like it "as is" and then you have to spend a lot of (unpaid) time fixing it up to please them. It may not be worth the five dollars. My solution is to get a drawing where I like it to be and then give a photo of it to the person. Very few people seem to care that it's not an original drawing.
Congratulations on your snake sales, by the way!
Jeff,
That's a wonderful cat drawing!
I found the Tony Ryder diagram. I like his discussion of what he terms "light - light" and "dark - light", which to me is more descriptive than "halftone".
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