Now post a few pics all over.
Try forums.
Try to chat to people.
The idea of such as twitter, Tumblr (and others) is to get people to re-post your pics.
You can treat Tumblr as a blog.
You do not need to post pics all the time (of you). Take pics of food your eating or whatever your doing and post them (make sure you do not tell people where you are).
See what gets the best response.
Its not easy running a solo model site these days. Even one with many models is not easy. But if you put the work in, you should get sales.