I would use Kindle picture viewer in full screen mode for that purpose:
Have more than one picture in /mnt/us/pictures/<any name>/, launch picture viewer in full screen mode, launch a script (i.e. with launchpad) that uses wget to download updated images time to time and generates "next page" events periodically.
On server side you need something that renders the images instead of HTML pages (ImageMagick ?, PHP GD ?).