User blog comment:HumboldtLycanthrope/Looking for photos for my pasta Clown Dogs/@comment-25052433-20150124021331

Google will be your best friend when searching for such images. DeviantArt or Tumblr may suprise you as well with the pics you want to enhance your story. Just make sure you don't take anything copywrited. As far as public domain goes, if you get a pic from someone's art site that is available for public domain, ensure that you give them credit and perhaps include a link to their page.