When you say, "I think fanlore would need to attract more fanartists who would like to talk about fanart," I totally agree. The fact that there are many articles about fanfiction attracts new editors who are interested in fanfic. I suspect the lack of articles on art may even dissuade fanartists from contributing—they must surely feel that that simply isn't what Fanlore is "about".

When I do an article on a website, I describe its contents; but I also try to discuss its design, i.e. layout and graphics. That's because I care a lot about the presentation of my own website; so it's something I notice about other sites, too.

Basically, the articles in Fanlore reflect the interests of the editors. We just don't seem to have (m)any art editors.