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I draw cartoons regularly for several business and trade magazines. And I find that the often dry, serious subject matter usually lends itself quite well to cartoons. Whereas if someone asks you to come up with a cartoon for a story that is already funny or bizarre in some way, that's a far greater challenge.
By the way, I know there's only three legs on that chair. There were four, but it looked cluttered and distracting so I took the fourth one out! The perspective is out of whack too. But it matters not a jot, because it's a cartoon. That's the beauty of the artform. If anyone questions it you say, "Tut, That's my style..."