Board Thread:Support Requests - Getting Technical/@comment-842519-20130715051421/@comment-188432-20130715155132

You can't use category tree to display images. The fact that images are displayed with categories is due to the existence of a Wikia-created extension. That extension — or bit of added-on software — is something which the makers of the category tree extension — who are not Wikia — did not anticipate. Thus, there's nothing about category tree that can help you out.

I'd say, too, that it's detrimental to your category structure if you're going to redirect category pages to the main namespace. Category pages really need to operate within the category namespace for maximum efficacy.

Your only real hope is DPL — and specifically the include(page) parameter. But I dunno if you even have DPL enabled on your wiki, and are willing to spend some time investigating it.

If you are, here's the DPL manual page and here's an example of how graphics and DPL can mix together.