anything will sell at the right price. we have a couple terrible sites out there and they still make good money. of course we have a couple that make a million a year too so it helps balance it all out.
if you're not into giving away free images, then you'll probably have to stay away from the tgps. so that leaves a problem of where to advertise?
once you have a nice base, it will be easy to launch new sites and make them profitable. our first site took quite a while to make big money but now we can launch a site and get a couple hundred signups in the launch weekend.
having a low # of images isn't always bad. one of my all-time favorite single model sites is
http://www.groove2000.com/. she's always done really well.