We don't frown at resurrecting old threads as long as there isn't too much topicshift involved. It is much better than 20 threads about similar subjects which seems to be the norm elsewhere where zombiethreads *are* discouraged.
It is possible to post large photos instead of the thumbnails. The procedures are detailed in a blog post I made and in Nicole's answer to that blog. This has the advantage that the storage available for attachments isn't affected. Site supporters have unlimited gallery space but still limited space for attachments.