I'd buy 50 good semi-exclusive niche type pics and do 3 TGP's, 2 Free Sites and one AVS site.
Start with the TGP's, fiddle with them a bit to make your free sites, then use your 4 Free Site galleries as the inside pages of your AVS site.
Max out what you've got and don't depend on one business model. And when you buy your own pics you're not depending on any one sponsor either
Or buy 500 good semi exclusive niche type pics and do 30 TGP's, 20 Free Sites, and one mini-paysite premium AVS with recurring income which I would advertise on the TGP's and Free Sites.