For all cats' staff like us, Cats are People, definitely. Every time, I want to comment about a cat photo on Flickr, I don't know how to start. “IT” is not a polite pronoun to use. “HE” or “SHE” would not be polite, either, if you guess wrong. So, I usually use “Your cat ...”

Is there any tips to say a cat is male or female by a photo?

Am I too over? Try those parents.