The technique european painters developed of modeling mass in two dimensions through value, which is demonstrated in da vinci’s the virgin and saint anne with the christ child and john the baptist, is called

i remember learning about this, and if i am correct it is called Chiaroscuro

i am not completely sure but i hope this helps

Explanation:

i got this answer from a really friend, and it was right.

hope this you like it me and a special to that dude!

artists need to create a realistic interpretation so that people in general can relate to the artwork. for a common people, an artist's impression gets increased only if he can create something which would look realistic. an abstract is difficult for a common people to understand whereas if a person can draw a girl with simple pencil sketch and if that looks like a real figure then the latter will be praised more than the former.