One of my friends was one of his models, and was even depicted on the back of Reader’s Digest.
http://bwpowell.com/mountainmen/index.html
I'm a portrait artist and was fortunate enough to've lived in the Berkshires at the right time, getting invaluable critiquing from Norman Rockwell, Robert Brackman, and lessons from great artists, including William Shultz.
http://www.art-exchange.com/artistbio.aspx?ArtistID=74218
Robert Bateman is an all time favorite also. I have a friend here, an International Award wining scrimner, that studied under Bateman.
Another of my favorites: Frank McCarthy.
Now I am getting itchy to get my paint pots out!