I think that this is a good photo because it focuses on the giraffe and there is a lion waiting for its chance to pounce onto the giraffe.
http://jetaroundtheworld.files.wordpress.com/2010/11/n01_alex-tan.jpg
Bad Photo:
I think that it is a bad photo because it is quite blurry.
http://www.facebook.com/photo.php?fbid=1273864862596&set=t.100000001145033&pid=500045&id=1709187668