A variety of realistic paintings drawn with crayons

When you say crayon, there is an image that children use in kindergartens etc ... There seems to be some people drawing graphic paintings using that crayon.

Appreciation is from the following.
Don Marco, The Master Crayon Artist

It is Odoroki that we can do even here in crayons.

By the way, why are few artists who used crayons? I thought it and found out that it is the reason for that.

Crayon - Wikipedia

However, it is difficult for artists to use it because it is difficult to synthesize colors.

I see. Certainly, it is difficult to mix colors with crayons. So that means that this realistic painting is drawn from the very beginning with all kinds of colors finely?

Omake: Spider-Man introduces Crayon