Brother using photos of me??

My dad asked me if I could switch off my brothers laptop while he is away for the week, so I agreed. I went into his room and went to press shut down. However I noticed that my Facebook profile picture was saved on his laptop, it was as one of those icons that can be displayed on the wallpaper of your desktop. I didn't properly delve in and investigate as my dad was in the room, but make no mistake it was 100% me. There was one other photo of a girl I didn't recognise she wore a short black dress, showing lots of leg and looked "attractive" I guess. Don't get me wrong I am not a pretty looking girl and my photo is literally a head shot of me. What the hell do I do? I have a really bad creepy feeling that he may be using my photo as a dating profile. He isn't open about his sexuality, but we have our suspicion that he may be bi. Even still I would be terrified if he is using my photo to attract guys online! AGGHHH! What the hell do I do? ??