In my opinion, you should be thinking about the following things:-
1) Making sure every jpeg of you has your url on it. That way, even if your pics end up on a newsgroup or yahoo group, you have a free advert as to where the pics came from and surfers interested in your niche will come over and take a look.
2) Your tour needs to shout about the specific niche more. Anyone who arrives at the first page should have "LARGE CLIT" in their face (bad choice of words) say it once, say it twice, drive the niche at them so it is obvious very quickly what makes your site different to any other site. The theme of the tour needs spelling out even before they see the sample pics.
3) Affiliates can easily be set up by CCBill, just ask them. Then get some promotional content for the affiliates who will then drive their traffic at your tour. You will need a few banners and a price that is similar to other sites which operate affiliate programs.
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