To determine where values change when light moves over an uneven surface by using a range of values to paint the different values in a realistic, monochromatic self-portrait;
To effectively communicate an image that looks like you through careful examination of the values and structure of your face.
To paint facial features using values, You first need to create an outlined image of your face. Then, you need to label the drawing with different values (1-7). Then, you use the sketch as a blueprint to paint the values on top of.