If I share the root of the site link on facebook all the photos appear on the site, including the products. Example: http://rotinaarts.com.br/downloads/tela principal.png. If I put a link to a specific product picture appears.
This is a templete Hellomix problem of why this is also the site that has the showcase: http://www.sugarandspice.com.au. In other templates I tested this problem does not exist. There must be something in the programming of the template that is blocking the image search function facebook.