Angela, it happens. And often too !!! Personally I recently found a photo of me on the cover of the Spanish edition of a book by a famous Italian philosopher paid a "very suspicious" amount !!! By now I don't look at individual sales anymore but I concentrate on each agency on the total income, then doing the average on each photo sold, otherwise it's time to close. my time has a price and considering the number of sales I certainly cannot chase each bitter reality.... (sic)