Curate, connect, and discover
mmm.. I distinctly don't need more projects right now, but I can tell you what would help get stuff that I have already drawn (and likely that other people have drawn) or am planning to draw anyway onto the wiki.
Make a "Welcome Fanartists!" page (or something like that) that is easy to find from the main page. This page should first and foremost have simple detailed instructions for how to add art to the wiki. These instructions should assume that the person has no idea how to edit the wiki at all. If there is someone who is willing to add art that they are pointed to, you might include instructions for how to tell that person that your art is available to be added. If there are any ground rules for what kind of art should/shouldn't be added, include it here.
After that section, it might be useful to have a list of "things it would be nice to have art of" that fan artists can go look at when they feel like arting but aren't sure what they want their subject to be. If you wanted to, you could have these grouped into a couple of different priority levels (perhaps: It's a disgrace that there is no art on this page, it would be helpful to have art on this page, this page has some art but could use more, this page could use art if it happens to be something you are excited about drawing). If there is a way to have them in a table so they can be sorted by priority level, planet/book, or type of thing (maybe: people/plants/animals/things/other) that could be useful. That way if someone is thinking "mmm I want to draw a Mistborn character" or "I want to play with the plant life on Roshar" they can look to see what we could use.
Once you get that page functional, throw it to tumblr with a short list of pages that could use more art.
Cosmere artists! I seek your opinion!!
If there were some notice/notification on wiki pages which pointed out or asked for art to be given for a particular topic or section. EG the Shardplate page has no art, and would probably very much benefit from some, to help describe it.
Would people be ok with requests like that, and would artists actually contribute more than they already do?
I just want to increase the contributions and make it a more informative source and make editing and helping out more attractive and easier? I don’t know what I’m doing tho really. Please help XD