Here's a great tip to turn any photograph into a convincing and hilarious cartoon. Take a photo like this one of a boy holding a fish. Just an ordinary photo right? Wrong! It's also a cartoon!
Open the photo in photoshop or other such like photo manipulation program such as Windows Paint program.
Then you aplly one of the filters to it such as I thus did here (the fresco filter) - and hay presto you have a wonderful cartoon like image which is probably better than something a cartoonist could draw anyway.