The Thing, The Black Cauldron, Caveman, Return To Oz and Ralph Bakshki's "Wizards" are some of the films comic artist Mike Ploog has worked on. He's also worked on the animated Heavy Metal film, he's listed as a designer for the segment involving zombie WW2 bombers "B-15" written by Dan O'Bannon. His comic work includes the 1970's version of Marvel's "Man-Thing" and "Monster of Frankenstein" series.
See more art by Ploog here and here.
Click here to see another painting by Ploog.