The search criteria is like this...
Screenie one, you click on the
+ sign on the right and this will make a drop down box appear where you can choose the search criteria. You choose in this case,
Visibility.
When you click ok, you now have a new search criteria that appears (screenie 2).
And yeah, I kinda figured your image wouldn't be in that folder: like I said, that folder is available to every user on the computer, makes no sense to me that your user stuff would end up in there for everybody else to see and use because this is personal info or data. I truly think this is something that would be found only in your user account somewhere.
Edited to add:
DOH! One question I forgot to ask you... Can you still choose that user setup picture for your user data like for your vCard in Address Book for instance or your iChat icon? If you can't, maybe it was deleted by mistake?