Using natrual light and shadows to create different shades of color.
top. A shawdow is cast on the side of her face and on the outside eye. The light is mainly focused on her shoulder and face.
bottom. His light is coming from the left lighting up the back of his head and creating a dark shadow on his face.
bottom. His light is coming from the left lighting up the back of his head and creating a dark shadow on his face.