Membership With Portfolio And Photos

Hello, This is concerning http://www.durtyangels.com (18+). Alright im adding a few new ladies onto the website and they paid from another website. I am wanting to do this aswell so these models will get paid. Membership wise they will with 18+ content. Once I figure this one question out before installing it then I am adding Membership Plugin and going to charge come October 1st. When I add an image on Portfolio that is 18+ I want it to be replaced with another image (I Make) that will say Paid Members Only. How can I go about this? Will Membership plugin capable of this or is there another plugin I would have to get?