Let me be the first to welcome you to Techimo!
Its a good place to hang out. Watch out for the pranksters though!
The pictures are called Avatars
You have a little ways to go yet.
You have to have 50 posts first. When you make your 51st. the option becomes active in your user control panel. Posts in community don't count though.
It won't take you long though asking and answering questions is all it takes.
JD