How to deal with upset buyer?

Hi. Casual eBay seller. I recently sold an autographed sports photo for five bucks. The buyer received the photo and told me that it was "smeared pretty bad." I apologized and asked for photos. He sent me these zoomed in photos. I guess I can see spots where the ink has washed out or whatever but really doesn't look smeared? Also it was five bucks? I guess somehow during shipping it must have happened? How would you deal with this guy?