None of the commenter, except for you appear to be hosted at wordpress.com. Avatars will only show up for people who have an account here at wordpress.com and only if they are logged in. None of your commenters have URL's tied to their usernames from wordpress.com. One is from flickr, one is from blogspot, and two don't have a URL connected to their names at all. Since you don't have an avatar showing up here in the forums, I would assume you do not have an avatar uploaded.
It won't show up unless you make one and upload it, and people who do not have an account at wordpress.com will not have avatars.
I signed up for A acct: today username only I'm A (co-blogger/editor) for http://gamingnewshq.wordpress.com and I did upload A piture but it's not showing up the owner of the blog helped me upload A picture and he's stumped to on this. and can'tfigure out way It display.