Comic book/commercial artist Neal Adams did covers during the 1970s for ERB's Tarzan series published by Ballantine Books. His action sequences are just awesome! The covers for the previous editions by BB were painted by Robert Abbett who was quite good.
Gino D'Achille painted the covers for the Barsoom books I own. Also a fine artist.
The Brothers Hildebrandt did some other BB editions of ERB's books.
Frazetta's ERB work is AWESOME!
But I have a true fondness for Joe Kubert's Tarzan of the 1970s published by DC Comics.