The picture magazines use this type of character study constantly. The difference between a character study and a portrait is, very often, the difference between the personality of the subject and the impression or image he or she would like to create. A portrait is usually a premeditated plan to present the subject in the most favorable or flattering pose. Character studies are another thing entirely. They portray real people doing real things in the real world.
Few people can be natural in front of the camera.
Sitting for a portrait is to the average person like sitting alone in an empty room while fully aware that a hidden observer is watching every move. It's an uncomfortable feeling. And the most difficult job the photographer has is to dispel that feeling. The mechanics of exposure and lighting involved are of comparatively little importance to your subject. It is you the photographer who should have these elements preplanned and under control.