One of the factors search engines calculate is the number of relevant external pages that link to your simple.  Simple 'add your link' pages are discounted.  Here are several ways to promote your images and increase the google pagerank of your webpages.

GLOBAL SCAVENGER HUNT:
 Go to   http://pix-now.com/games/hunt/adm-addtreasure.htm
  where you can define treasures from around the world - for each item, you can include both a URL to your webpage and a URL to your image [your choice of size].

When people play the game they will see these links.  In addition, we create a physical page for each treasure, that is picked up by search engine crawlers.   the current version of the game itself is at http://cascoly.com/games/hunt/main.asp

ONLINE PUZZLES

We host the software, you provide the images - you can link to an unique page showing your image(s) as a puzzle.  YOur linking page can work like this: http://cascoly.com/games/puzzle.asp