Art has nothing to do with proportions and a serious photographer isn't necessarily an artist. But to give you an idea about your question, I propose that you look at the photographic work of David Hockney, and you'll see how a great artist produces wonderful photography art with a Polaroid for example.
Moti
A good example - or seek out
American Surfaces by Stephen Shore, shot with a little 35mm Rollei compact camera and strobe. Shore is a very influential photographer who has used equipment ranging from large-format view cameras to toy cameras.