You can also promote the images or photos placed in your site. Photobucket, Flickr, Picasa are major sites to submit your photos. By placing a link on the photos, you can also create backlinks which directs a user to the site when clicked.
List of Photo Sharing websites-
a) imageshack.com
b) imagebam.com
c) instagram.com
d) photobucket.com
e) mediafire.com
f) picasa.google.com
g) plus.google.com
h) tinypic.com
i) tumblr.com
j) twitter.com
k) weheartit.com
l) www.flickr.com
m) www.panoramio.com
n) www.pinterest.com
o) www.shutterfly.com