Most of my users are frequent Pinterest Users.
All of my images are via CSS. Users love it for the ease of navigation in my niche! This site has the best metrics I have ever seen or heard mentioned.
I get at least 2-3 complaints a week of the lack of images specifically for Pinterest use.
I have added an out of the way (lower right-below fold) image that is a preview of item they are about to download. Solely for the purpose of allow users to Pin the page.
Can anyone foresee this hurt my SEO?