Rather than needing to post image links into regular tile graffiti, I suggest to be able to set up "posters", which are image links that are resized to 70 x 120 or something (and visible in full size if you click it), and visible in the Description pane.
Example of a poster:
It could also be used to put up faction emblems, anime pinups at your favorite bar, or even used as a graphical way to describe/illustrate the landscape of your stronghold.
