“The portrait artist must acknowledge human complexity with each brushstroke. The eyes, nose and mouth that compose a sitter's face, just like the suffering and joy that compose his soul, are similar to those of ten million others yet still singular to him. This acknowledgment is where art begins. It may also be where mercy begins. If criminals drew the faces of their victims before perpetrating their crimes and judges drew the faces of the guilty before sentencing them, then there would be no faces for executioners to draw.”