He is referencing  your guides and to search on google. There is nothing that infringes your copyrights there or nothing ethically wrong with that in and of itself. The post is publicly accessible. If he is using your photos then yes he is infringing your copyrights. BUT You also have not attributed your photos to any kind of copyright license. Whether it be Creative Commons or any other kind. And a poor mans copyright is notoriously difficult to hold up in court. That said if it's an issue contact amazon and let them sort it out.