The only way I found to have that work is to get to the new armatar set you unlocked, then deleting a few of your comments so that you lose that set. Once setting that new image, your current armatar should be blank, or the swords + shield. If you were around with the Halloween armatars, you could also have this happen by keeping the same image until they were removed. But the images aren't around anymore, so you would have to go with option #1. =)