Someone can correct me if I’m wrong, but I’ll take a stab at it:
There is, of course your screen name. The pictures are called “avatars” and are chosen by the members; I haven’t had an opportunity to look around so I can’t tell you if there is a list of standard avatars you can choose from that come with the forum, although it’s obvious you can upload your own (you probably want to check this out by clicking on the links “Your Control Panel” or “Your Public Profile” at the top of the screen).
The designation “Newbie” and “Member” - I believe I saw “Jr. Member” as well - and the little red squares are predicated on how many posts you’ve made. I’m still a “Newbie” with less than 10 posts, but Patrincia is a “Member” with over 60. I’ve participated on forums where there have been members with literally thousands of posts who have designations like “I Have No Life” and such.
I believe that covers the waterfront.