Lighting a figure
If your values are correct the drawing will have a sense of 3 dimensions. If your colours are correct it will make the image glow.

If your values are correct the drawing will have a sense of 3 dimensions. If your colours are correct it will make the image glow.

There are key tonal elements that exist on a form. the light value, the dark tone, the core shadow and the reflected light. Then you finish with a restrained highlight that only appears on the peaks of the forms closest to the direct light and any cast shadows that might occur because of overlap.