I think Pinterest is good if you are advertising, or promoting your photography/picture site. Pinterest is the ideal place to share pictures to people, and there's a good chance yours may go viral. People will start pinning your pictures, want to see more, and you can send them to your website if they are interested. I really have never used Pinterest, but I would believe that they have a tab where you can write something whether it's an 'About Me' or 'Status Message'. On there, you can most likely paste your website link containing pictures.