What kind of actual fucking monster does something like this. This is disgusting, abhorrent, and should be illegal. So this man makes pornographic cartoons of real underage children and not only creates them but presumably distributes them? That is literal evil. Ever hear of the saying "what goes on the internet, stays on the internet forever"? They may be "just drawings" be he is still pedaling a form of child pornography, just turning the "model" into a cartoon presumably to get a fix for pedophilic perverts. Not only that, but as I said this thing will forever be on the internet and there is no way scrub it off 100%. Imagine a little kid hearing from their parents, authority figures, fellow school kids, friends, etc that there is a dirty drawing of them online. Can you imagine how that would affect the child socially and psychologically?
What if the shoe was on the other foot? Can you imagine if someone got a naked or suggestive image of you but "cartoonized" it and then just said "hey, its just a drawing"? At the very least I would consider this some kind of harrassment, invasion of privacy, psychological abuse, and maybe even defamation. This doesn't sound like an issue of free speech.