You just need a great layout, not all spread out full of the BS text come ons and all of that. Precise advertising works best..
Something gallery makers forget that DOES transfer over to us directly from most ALL surfers...
We are the Carnies with the come ons... Do NOT treat the surfer as a Rube.. Build up trust with your galleries! They may not buy on their first time on one of your galleries but give them nice pages with no BS and they will remember. And perhaps buy on the 2nd, 3rd or 4th visit.