Joerg Colberg tells you why.
“Unless I told you you’re looking at my mother, I’d be foolish to assume you’d know that. Seen that way, photography actually is a very limited and problematic medium, which is, I’d argue, the only reason why it can be art: it looks like it is telling you a lot, but in reality, it isn’t.”
“Don’t approach writing about your photographs by making them first, and then getting to writing about them. That’s not a good idea. Instead, take photographs and write. Look at what you have, both in terms of pictures and of writing, and see what works. Constantly re-evaluate what you have.”
http://cphmag.com/how-to-write/
Creative Camerawork 