Darktiste Sketchbook

[JosephCow]

I guess it depends on if you are going for a pass of soft ambient light coming from a general direction, or hard light and shadow (chiaroscuro). If it's the former then actually most of these are working pretty well, it doesn't take a ton of contrast to get the form. But if it's the latter then we need to see a hard division of light and shadow, and cast shadows.