I just discovered the incredible Japanese illustrator Shusei Nagaoka. His work ranges from album covers to movie posters to magazine graphics, all made in the 1970's and 80's. I hope to someday have the patience to reach this quality of rendering and detail. Below is a sample of his work.
Earth, Wind & Fire: “I Am” (album cover inside), 1979
Deep Purple: “When We Rock, We Rock…” (album cover), 1977
Munich Machine (album cover), 1977
Via Pink Tenticle