As light bounces off the objects - it molds them by creating lights and shadows.
Value is the amount of light reflected from a surface.
As light shines on objects - it generates lights and shadows.
Value creates depth within an artwork - making objects look three dimensional , appear closer or further away.
It does this by creating a range of tones within an object and its background.
Different sides of an object cannot have the same value if they are not facing the same direction.
Use reference photos to shade the forms using Chiaroscuro pattern.
Pay attention to the use of reflected light to add an illusion of air and light in a picture.
Emphasize foreground corners and edges by creating (exaggerating) a strong contrast.
Tone down the contrast in the background to make it appear further away.
Don't forget to shade background!