3) Clear your mind of subject matter prejudice

This is most important for photographic categories (such as General or Pictorial) where many different subjects are judged together. If you don't like sailboats, abstract patterns, or sunsets (heaven forbid!), remember that meaningful images can still be made with these subjects, and that you are a "photo judge" not a "subject judge". The idea here is to avoid letting the likes and dislikes in your personal world color your objective judgment of someone else's artistic vision.  With this mental attitude, your photojudging may even allow you to better appreciate the visual diversity of our outside world!