Good and bad are too subjective, I also dont believe schooling will teach you to discern if a photo is "good" or "bad" it may teach you to identify techniques, influences, and styles as well as the tevchnical merrit of a photo although all that stuff will just make you sound pretentious. I tend to judge a photo by the amount of time I look at it. In my opinion a good photo is one that you are drawn to, one that leads your eye around the picture and one that invokes some kind of emotion. To that end I may find a photo of a location of a fond memory much more interesting than someone else, does this make it a good photo though? For example I see many photos posted on this site that I believe are just plain bland no emotion, no subject, nothing to really look at although many replies to these posts say things such as "I love it" "Great photo" "wonderful composition, I wish I could take photos like that" now are these people wrong or is it me , there is no answer, I would suggest to post photos you like on your site although dont be too specific because everyone has different tastes