From a client point of view I wonder if the image page has got too in the way of words and not enough pictures. It is unlikly they will scroll down to find the Similar images unless they know they are there.
Can keywords and categories either
be hidden or
made much smaller text (if anyone can give me the css for this I will do it, I have been trying)
have option to put below similar images (I have mine full width and like them that way, putting on side also means scrolling to find them)
Our photo information also takes up quite a lot of room