The document discusses value, shading, and photorealism in art. It defines value as the lights and darks in a work, and notes the range from black to white with shades of gray. Shading is applying media more or less densely to create light and dark areas. Photorealism aims to make images look like photographs through highly detailed rendering and sometimes using a grid technique. The document provides examples of photorealist Chuck Close's self-portraits and grid-based works, and shows student examples applying these techniques to portraits.