FTP access is logged too. So just by going though the log files someone should be able to find out what pictures were uploaded/renamed.
Problems with cheaters are the reason many free hosts stay away from FTP.
What also could be a good solution is to give people FTP-access to a sort of upload hatch. Once you're done uploading and disconnect a script could synchronize the "real" webpage with what is in the upload hatch. But not after checking what's in it of course.
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