I collect old black and white photographs. They are very compelling visually. The history makes me think to myself about the time and setting of the photo.
Over the years we have seen black and white take on a new artistic value in both genres. In fact, it is not at all unusual any more to see a very modern movie filmed entirely in black and white. It is also common to visit a fine art museum and find a photographic art display that uses black and white extensively. Black and white has some artistic and emotional qualities that are just not possible to achieve in color photography.
Probably the strongest quality that grabs the viewer with a black and white photo is its emotional power. Even if the photo is just of an old barn or an antique car, there is an emotional appeal that is difficult to analyze in words but universal to all of us as we look at a black and white shot. That is why black and white photos almost instantly take on an artistic look. So if you are evolving your artistic photography style and portfolio, including some experimentation with black and white will do a lot to improve your work.
Black and white also focuses the eye on the emotional center of the piece. Probably the best subject for black and white photography is the human face. In even a tranquil expression, the viewer can see such a vast range of expression in the eyes, the tilt of the head, the subtle wrinkles or peculiarities of the face and the focus of the gaze.