Avatars in Spark - How to locate its Directory?

Guys I have a problem in one of my Users in Spark. They put porn Avatars and other users dont like it. The question is how do i change or locate those avatars? is there a way to locate it? ive search over the Openfire Server Diriectory but havent find any Jpg or images. i tried in the Database but i dont have any idea wich Table.

Can you guys help me out? thank you so much