The images have to be approved of course, to ensure no one's posting anything inappropriate or against the rules of conduct.
It was always better safe than sorry. As for image approval, waiting. Gotta wait until a mod or admin approves it. I doubt this place will be like Turner on the ASMB. They have very strict image approval rules, and it can sometimes take up to a full month to get an image approved.
Give it time. They JUST gave us back Lithium (That's what I'm most grateful for by far), and the mods are probably busy with other things. They have more important things to deal with than custom avatars for the users right now.
You'll most likely see it get approved within the week.
Geez I don't know a whole week (approx)? If even then, with the whole feedback and avatar sub committee hearings they have planned? It's like they don't trust us. That's no way to foster community. It's not like the original system was broken or these ones will be replacing our avatars on psn, or wait will they?