What is a good photo and what is a bad photo?

<-- What makes this photo a good photo is the color contrast, how clear it is, its angle, lighting, and how interesting it is. The colors contrast well so the dog is not blended in nor is anything else. You can see that they are separated but not so much that they look like separate pictures. It's very clear so you can see what is there, the subject being my dog. The angle it straight but it is higher than the dog (you are looking down at it). It's interesting too because the dog looks cute cocking his head to the side.
(Worst picture EVER!)--> Okay this is a very bad picture.. For one it's really blurry, all the colors are mixing. It also has a red tint to it so even if it was clear the lighting would still be bad. You can't really tell the angle in the picture. This doesn't look interesting at all, unless you find wondering what the picture is interesting...