I hate to be the hippie college student, but one thing to think about that will always make your pictures better is the thought put into the underlying meaning. Anyone can grab a camera and take some cool shots, what makes photos great is their purpose. Ideally in a photo all the elements should contribute to the purpose of the photo, whatever that may be. By purpose, I mean theme or emotion you want to convey. The objects in the photo should say something about that. It can be an idea or concept that only you understand, or something that everyone can relate to.
This carries over to film and most other art forms as well.