This whole ad looks like it was created by Continuity Associates (aka the Crusty Bunkers), the graphic design studio founded by Neal Adams and Dick Giordano. Isis in particular looks like she was drawn/inked by Mike Netzer (then known as Nasser) or Alan Weiss. Other possible artists that I could guess worked on this ad would be Rich Buckler, Joe Rubinstein and Bob Wiacek--with Adams and Giordano contributing their touches.