clean galleries only which means no pops, layovers, or interstitial ads before the content.
all submitted galleries must include a reciprocal link to get through the submission form.
sure, you can have ads on your page, but none of the annoying ads.
your galleries appear on the front page and you're not required to send any of the traffic back.
apply here with three samples of your links.
http://www.twelvefifteen.net/tgpx/partner.php?r=request