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Just looking at the form, there are
four elements: highlight, mid-tone, core shadow, and reflective
light. The mid-tone and
the highlight are the areas that are being "hit" by the light
source.
Mid-tone: The tricky part here is to
mold your mid-tones so that they accent the form of the object.
Artists tend to flatten this part out by making it too light.
It's crucial to round of the shape with your
middle tones.
Highlight: To be
effective, the highlight has to pop a bit. It should be many tones lighter
than the other tones.
Core shadow: The core shadow runs
along where the light ends and the shadow begins. This is
perhaps the most difficult part for artists to get right. It is
not intuitive to darken an area inside the
outline/edge/contour of the shape. One common problem is that
many artists make the edge the darkest. This will flatten your
form. Therefore, look for the darkest part of the form to be
near where the light ends and shadows begin.
Reflective light: The reflective
light compliments the core shadow and rounds off the form of the
object. One mistake to look for is that the reflective light is
not a bright light. Think of it as the moon compared with the
sun. If you make it too bright, you kill off the direct light
hitting the light side of the form.
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