/ic/ - Artwork/Critique

ok i recently decided to take drawing seriously after years of 3/4 waist up anime characters with no construction. my question is am i going about this right, i use morphos simplified forms book for help but i can't tell if im making the right shapes, should i erase and redraw, or what. i really want to learn how to properly construct with forms. left is a trace of the picture. also i didnt draw her hands or feet because im too stupid to learn those right now, mostly im trying to figure out legs but im struggling.

if anyone has any sort of advice or tips i would appreciate it