Here are a couple of sketches of Roger Manning, the real-life model for Folkie Joe McCoustic. Roger had a pronounced resemblance to Kirk Douglas, down to the chin cleft, and for a while he sported a Spartacus-style brush cut. Eventually Roger traded that hairdo in for a half long/half crewcut. He never wore a reverse Mohawk- that haircut was my own touch of the ridiculous. Roger recorded several albums as well as recording his fellow performers at his home studio. Since 2001, Roger has made a living as a web designer in New York.
Roger performs his #16 Blues in 1988: https://www.youtube.com/watch?v=0sJ7yDmla0Q