Checked your profile in the admin panel and it says:
Avatars
User has no avatar
You can upload another one by going to "Settings" in the top right corner, click that and then on the right side find "My Settings"
My Profile
Edit Profile
Edit Profile Picture
Edit Avatar
Edit Signature
Profile Privacy
Click "edit avatar" and you can add one there. IDK where your avatar went but that's how to add it back. Hope this helps.
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