This is one of those drawings that I like a lot, because I feel it was almost completely successful in its execution... but like many of my drawings from the period of the late 1970's and early 1980's, I don't remember exactly what it was done for.
It is likely a drawing done to illustrate a story or column in "Hampshire Life", but it also just weird enough (worms in ice...?) to have been one of the drawings I produced for various horror/science fiction fanzines back then. Maybe someday I will stumble across the printed version and know for sure.
This was one more example of using the shading film which had opaque WHITE dots instead of BLACK dots. I found it a nice way to produce a muted effect when laid over black line work -- here it works to sell the idea that the worms are inside the ice cubes. -- PL