I was clearing out my attachment folder when I noticed that if I had posted one on a thread, and that thread was closed, I am unable to delete the attachment from my folder.
We finally figured this one out a few months ago. Nope, you will have to get a mod to remove the pic out of the thread. As soon as they do that it boots it off your attachment profile.
It would probably be best to PM your favorite mod (or me) with the links to the threads and the post # within where these pics are located. Makes it a bit easier than clogging up the RTM queue, and the resulting notifications to the entire staff.