Here are a couple of 1973-dated ERB illustrations from Ronn Sutton, a name familiar to followers of both my Wally Wood and Gray Morrow blogs. Ronn has been a big supporter of both in many ways. He was friends with Jones (an obvious influence here), Bode and the hip artist crowd in the seventies.
These are from an early Fantagraphics fanzine, ALWAYS COMES TWILIGHT, from 1976.
Here's a link to Ronn's site today. Still doing lots of great artwork (some as a courtroom artist!) as you can see and he DOES take commissions!