Licker,
Are you getting any search engine traffic from your free sites? I've noticed from the sites you submit that you don't seem to put much effort into seo. It does not take a lot of time to find relevant keywords to your images and write a little relevant text. By doing so, you will keep getting targeted traffic to your sites long after the traffic rush from link lists. Aside from that follow the advice you have been given so far and you should see some improvements.
