a. They only drew from the head up so that the picture is focused on the subject herself.
b.They only drew in dark colors and without a background so that the picture is focused on the subject herself.
c.The artist wants the viewer to focus on the woman and not any background, items or colors. It's just regular black, brown, gray and white.
d.Leda is middle class. She is mysterious, kind and alluring. She likes to relax and probably likes to draw. She cares about her appearance.