several hatchings such as cross lines and dots are used to represent the depth within this portrait. as seen in this image the darkness of an area is shown by doing a much more of a closer/tight hatchings.
Konstantin Chaykin Lunokhod Prime Watch Hands-On - by Ariel Adams - Read more and see the full photo gallery on aBlogtoWatch.com "I would venture to say that the Russian-made Konstantin Chaykin Lunokhod Prime is one of the most interesting watches in the world. Timepieces such as this really are much more than the sum of their parts from a description of the design. This is the stuff that helps define entire genres and sets the tone for other watch making regions...."