No one took or deleted it - that would only happen if someone had a WAAAAY oversized avatar and did not change or resize it after repeated requests. Was your avatar in your gallery or elsewhere on the net? Looks like it is at photobucket and you have entered an incomplete path/filename:

your avatar's X is trying to link to:

http://img.photobucket.com/albums/v4...Ball%20Python-

it's incomplete.