by Jean Sole
Heavy Metal magazine, December 1977
If any single cover from the early years of Heavy Metal could be said to display the quintessence of that magazine, then it surely has to be the cover of a 'biker' Santa Claus from the December, 1977 issue.
According to the Lambiek Comic Encyclopedia and his Wikipedia page, Jean Sole (b. 1948) began contributing art to the French magazine Pilote in 1971. Sole went on to become a major contributor to the comic magazine Fluide Glacial ('icy fluid') while also carrying out commissions for movie posters and theatre sets. A 2015 interview (in French) with Sole is available here.