Mike Lyddon reports via the GCD Error Report #11758 "After examining the covers it is apparent that the cover of issue 10 is by Moldoff. Placed side by side with his other Haunted covers, his style is unmistakable. Note the two human faces on 10 and 11 and Doctor Death on both covers. The same style, shading, etc."
The previous indexer suggested Marvin Stein ? for pencils and inks.