adding share to images on my page

I really want to be able to share an image from my page to facebook. for example, my page has many photos on it because it is a photo blog. I dont want to share the whole page to facebook, but sometimes i just want to share 1 image from the page or a user might want to share just 1 image. What do I need to do to do this?

The page I need help with: [log in to see the link]