This has been an amazing thread. When I saw Steven's example of highlighting I immediately had a flashback to 1971. My art professor, Jim Schwalbach (prof Schwalby) taught by exposing us to everything. He didn't really critique my work, just showed me examples of what a beautifully rendered charcoal drawing was. Then would look at me and raise one eyebrow. Believe me, I got the message. There were only 5 art majors (only the second year the school was open). We brought sleeping bags to the artroom, cooked hamburger in the microwave. When caught by the Dean we pitched tents in the woods behind the school. It was great. Thanks to all for responding, there is a lot of good solid instruction in this thread.
Jean