If you are commenting on a photo, please limit any criticism to *constructive* criticism, and even then realize that you are criticizing someone publically when it would probably be more polite to do it privately.
No personal attacks toward other members. This includes but is not limited to anything placed in your signature, username, avatar, title, and the post itself.
Everyone has an opinion, and many times it will differ from your own. Please respect other members' opinions and if you feel the need to argue, please do so in a nice, honorable way.