With the massive amount of traffic we have, we have to limit who can post pictures. We are at our limit webspace wise, and at the rate we were going in a couple of months we would have to shell out $150 monthly if we let everybody post pics.
So Admins, Moderators and Site Contributors have picture posting abilities. Please don't ask them to post pictures for you either.
You can still link pictures from other hosts in your posts. Check out the Help Section if you don't know how.