thanks man
indeed, blocking is the essence of drawing.
It is a term used a lot these days. In the 3d sculpting world.
A quiz on using shapes forms.
What matters (to you) what’s not.
Usually we add a lot of elements, which we have seen but not understood them.
Naturalism, the worse style of art. 
Behind these so called “naturalistic” masterpieces, drawing is hidden.
These masters driving us to illusions, that naturalistic details really matter.
A visit to the british museum, in front of the elgin marbles, made it clear to me.
No hands, broken or lost heads, completely ruined, 80% of the composition lost, after the explosion of parthenon (Morozini, history), They stand in front of us great as ever. It is the abstract composition of these amazing shapes, it is a bulletproof thing.