From Draw Like da Vinci: Profiles are simple, and direct. Da Vinci realised the potential in profiles as a powerful means of delineating characters. His many drawings of grotesque caricatures are in profile. Drawing profiles is an excellent way to begin portraiture. With only one side of the face to draw, perspective is not an issue. This allows you to concentrate on proportion and expression. The power of expression in one eye and one side of the face should not be underestimated.
[of Michaela, 1977 drawing] The far arm is small and faintly drawn to create depth. Even when drawing jet-black hair, the bare surface of the paper should be left in places to obtain the full tonal range. Avoid filling in as this flattens the form.