You can not submit any photos to PornPics since they do not allow you to do that. They add galleries and their own affiliate links to them and I never have seen them allowing submission.
However, there are other porn sites that indeed allow submissions and some of them are: PicHunter.com, TheHun.net PersianKitty.com, 6tgp.com, Outlawtgp.com, FHWL.com,, PremierPics.com, XXXGalleries4Free.com but most of them will not let you to add affiliate links.