I've been thinking about this for a few days and, sorry if I'm tedious and repetitive Rockmeister, I'm worried about the categories. Took down a book of photos by Karl Blossfeldt. He was a 19th century photographer of plants, for academic catalogues, research institutes, universities, etc. But he was such a wonderful craftsman, had such an eye for the beauty in his subjects, that today he is something of a legend, and art/photography collectors will pay a fortune for an original print. His photos are now seen as "art" (whatever that means) as are, say, Weston's vegetables and nudes or Irving Penn's portraits or still lifes.
So one could list Blossfeldt as:
Blossfeldt (1865 - 1932) - Plants, Scientific, Macro, Still Life.
And, say, Bill Brandt as:
Bill Brandt (1904 - 1983) - Documentary, Portrait, Nudes, Landscape, Abstract.
I think what we should perhaps steer away from is definitions like "fine art" and "conceptual," which are both subjective and pretty meaningless.