/ic/ - Artwork/Critique

i just dont fucking get it, how do i get a "feel" for the weight? what are these cones even called? are the cones purpose to give you something else to reference while drawing to simply make it easier? how do i know how wide to make the cone, or does that even matter? and for the curved lines mentioned later, is the cone still going to be a triangle? ive passed this page awhile ago but i feel like i miss something very critical and exactly here.