If the image is your original creation then it is yours. I haven't read feebay's T&Cs in a while (and have no desire to do so now). What T&Cs normally say is that you grant them (the site) non-exclusive rights to reproduce your copyright material. So the rights to the image remain yours.
If you have not kept the originals that you uploaded then I would fetch them back from feebay and stick my own stamp over where their logo has been placed.