Not sure who did this art but isn't it good? I had heard somewhere that it was Russ Heath but the faces look wrong to me. I know Dave Cockrum did some early behind the scenes work but doesn't look like his distinctive stle either. At least one website credits a "B. Brown for some of the early seventies PREHISTORIC SCENES art. Comics artist Bob Brown? Doesn't look too much like his either. Anyway, here, from my own recently discovered instruction sheets (which is all I have. No more models. Traded them to Terry Harman for comics in 1976).