Given that they deliberately break any links posted inside fic I'm inclined to think they'd be against it. I've been posting prose fic there for a while and nothing I've seen has made me feel like posting my comics there would be at all practical. Which, yeah, is annoying, since I write way more comics than prose, but what can you do :/ (Meanwhile, I could post my fanfic to DeviantArt etc in theory, but that just feels wrong)