I believe you are referring to Picassa, correct? From what I read online, Google (owner of the now defunct service) claims no rights to any images uploaded. You may need to check in with Google to see what the deal is with said image. It may come down to you sending them all the paperwork for the Lulu book as proof.
For Instagram, you upload to their servers. In fact, there is no way to my knowledge that you can link an image to your site, and I am not positive, but I don't think you can include a web address in a post, just hashtags.