After 32 years of marriage, I can draw a recognizable picture of my husband from memory. But it is still going to be a much better likeness if he poses for me. Imagine how frustrating it is to try to get a likeness of someone you don't know. For example, a model at an open studio session. Some artists have the ability to capture a likeness quickly. For me, what a struggle! I get closer and closer to a likeness the more often I have the same model. My favorite model is Senalka, who, alas, moved to San Francisco.