Alright, so here's the deal: I returned my iPhone 4S the other day to the Apple store about 3 days after buying it. The iPhone that I returned was set up using my Apple ID and iCloud ID, although, before returning it, I reset all settings and deleted all content from the phone... But I was looking through my photo stream tonight and I saw this random picture of this girl who took a picture of an ornament her Christmas tree. How can I prevent this from happening again? And does she have access to the pictures from the photo stream on my new iPhone 4S that I'm currently using?