Ed Hannigan is credited third under cover artists. Known for providing cover sketches that other artists finish, he did indeed do at least one sketch for this first issue. However, the one sketch this indexer was able to find had nothing in common with the finished art. He likely did more than one though, so his credit is probable if not confirmed.
Title page states the title as "Savage Dragon: Martian Spy!," but the story title page itself states "Savage Dragon-- Martian Spy."