There are no rules for good photographs, there are only good photographs. - Ansel Adams

A great photograph is a full expression of what one feels about what is being photographed in the deepest sense, and is, thereby, a true expression of what one feels about life in its entirety.

For me the future of the image is going to be in electronic form. … You will see perfectly beautiful images on an electronic screen. And I'd say that would be very handsome. They would be almost as close as the best reproductions.

Yes, in the sense that the negative is like the composer’s score. Then, using that musical analogy, the print is the performance. (Paraphrased as "Film is the score and the print is the performance.")