On my forum there are several complaints that Google search and Chrome does not let them see certain forum threads. After close inspection I found that certain posts are pulling remote images from sites that Google marked as untrusted. The particular site in question was planetsmilies.com
Just want to give you heads up if you do receive such warnings. In my opinion it is bit harsh to ban website from search if they are pulling images from untrusted location.
IMHO, you are stealing bandwidth from the remote websites (not to mention their images) so I would encourage Google to ban your sites altogether. Okay, that’s just my opinion but I’m sure you’ll find many others of the same opinion.
Recommendation: Either create your own images or find non-copyright images (or purchase licenses for copyright images) and serve them from your host. That would eliminate both the copyright issue and using others’ bandwidth ($$$) to support your website.