Artists' portraits and self-portraits reflect the time period and culture in which they are created. They are also effected by the materials and technology used to create them. Leonardo Da Vinci did not have access to photography or computers. Vincent Van Gogh benefited from the access to tubes of paint. Unfortunately, the tubes were created from lead. They did not know the effects of lead poisoning at the time. Artists became more mobile by the invention of paint tubes. Prior to this time artists had to be chemist to create their own colors and paints. Colors became more vibrant during this time period thanks to mass production of paints. Photography changed the world in the late 1800's. Motion pictures had a similar effect at the beginning of the 20th century.The end of the 20th century saw the surge of the digital world. Images became instantly produced and accessible to the masses. The creation of the Internet linked the world together and launched us into the information age. Cell phones, iPads, etc.... created a new genre in the visual arts called "Selfies". You must create a portrait imitating the style or compositions of one of these artists.