Portrait Photography ... The purpose of these two lights is to mimic the natural light created by placing a subject in a room near a window. The daylight falling on the subject through the window is the Key light and the Fill light is reflected light coming from the walls of the room...
Portrait Painting ... Over time, however, it became more common for middle-class patrons to commission portraits of their families and colleagues...
Self-portrait ... In the earliest surviving examples of medieval and renaissance self-portraiture, historical or mythical scenes (from the Bible or classical literature) were depicted using a number of actual persons as models, often including the artist, giving the work a multiple function as portraiture, self-portraiture and history/myth painting. In these works, the artist usually appears as a face in the crowd or group, often towards the edges or corner of the work and behind the main participants...