(Size is from memory, maybe it's just A4-ish. Click image for larger photo, or read on...)
This is a paraphrase* over an illustration printed on a commercial product; a plastic drinking bottle. The original illustration was made by Danish artist Poul Pava.
* Paraphrase: A copy with some deviations from the original; ie. an interpretation, not an exact copy. In this case the line-work is a very close copy -- you will need a trained eye to spot the subtle differences.