Stephen, I believe these questions would best be addressed by you.
(1) How does someone (newcomer or registered user) find what images have been uploaded into CZ and are available for use in articles? In the past 3 months or so, I have uploaded 57 images (diagrams and photos). If I had not created my own image gallery (see
http://en.citizendium.org/wiki/User:Milton_Beychok/Image_Gallery), I would have one heck of a time trying to find them.
(2) Is there a categorized set of image galleries? By that I mean, is there a category where one could find all the images relevant to physics? to chemistry? to biology? to engineering? and so forth?
(3) Are there any sub-categorised image galleries? For example, a gallery of all map images as a sub-category of all the images relevant to geography? As another example, a gallery of all power plant images as a sub-gallery of all the images relevant to engineering?
(4) In many aspects, what I am asking is do we have any navigation system for finding groups of images related to a specific subject? Much like the system that Wikimedia Commons has.
(5) Is there a help page somewhere in CZ that explains how to find images? If there is such a page, would it not be helpful to include it in the panel on the left-hand side of each page?
Milton Beychok