Rename your pictures.
If you have a couple of pictures of photos in your page, rename them with relevant keywords.
Example: if you have a site about selling Ford Mustang.
Rename the first pix/photo as 1964-ford-mustang-for-sale.jpg
and the second one as used-ford-mustang-cheap.jpg
instead of the usual photo1.jpg and photo2.jpg
That will bring more images traffic as well.
In fact, MOZ has a very good tutorial for newbies and it helped me a lot several years ago