What do you mean, "post as pictures"? You mean, as pictures of handwritten pages? I'm not sure there are any rules against it, but it might be harder to get reviews. People are used to just seeing type to review. A lot of critics copy and paste quotes from the work, as well, so posting the work as pictures would make it harder for them.
If you mean you're working on a graphic novel, then you should be able to. I'm not sure on this, but I think it would go in art and photography. Or, maybe "other."
Hope this answers your question! PM me if you have any more. ^^
~Rosey

