I just looked at the guy's art, and... What's your point? I've seen SO MUCH WORSE on FA.
I've DRAWN so much worse.
I checked out this guys stuff too, and I've seen worse too.
OP, I don't think you can pick and choose the quality of the free artwork you're interested in. It's the internet and if your niche interest is inhabbited by people who post pictures you don't like, I think you have to eat that.
We can't have the mods here banning people for posting stuff on the site some dislike. If some Internet-wide mods were in existance and banned artwork offensive to the masses,
FA would not exist... Ridiculous as the artwork is, I'd argue that it's ability to inspire disgust, humour or otherwise provoke an illicit response thus gives it artistic merit.
Take some responsibility for yourself and either put up with it, or set your account so you cannot view mature images.