Bonington.com

If you only ever submit your website to one other directory, the place to be listed at is the Open Directory Project (http://www.dmoz.org)....

When you initially submit your link to the directory there is a field titled "From which website did you discover the Photography Directory...

If your site is listed our directory, however a screen shot of your site isn't displayed, then your link probably is not indexed at thumbshots.org...