- use disposable domains which are redirected to your main site
- use blogger redirection, they only ban the part of the domain in red ________.blogger.com, but you can always rename a blogger blog
- use url shorteners (more than likely the major ones are already blacklisted, try some lesser known ones or even better, create & use your own)
+1: you can try watermarking your photos, but i wouldn't recommend that, it looks spammy as fuck