This art is from the wraparound cover of the Palladium Books-published "Teenage Mutant Ninja Turtles Guide to the Universe", described in a wikipedia.org entry as follows:
"Teenage Mutant Ninja Turtles Guide To The Universe is a role-playing game supplement to the Teenage Mutant Ninja Turtles and Other Strangeness game. It was published by Palladium Books in 1987 and uses the Palladium Megaversal system."
As I recall, I had a lot of fun doing this drawing. I even did the colors on it for the finished published cover. -- PL