ok i have a huge problem when i try to learn drawing the human figure.

1. most of the time working on this is trial and error, i never feel comfortable drawing humans
2. what is the best way to start with a study? what should i look for. most of the time i notice af terwards that i made a mistake in the way i turned the inital sketch and its often to late to change this. also feeling unconfortable doing this

3. most of the time i have a tendancy to make the person to wide. the initial image she looks much thinner.

4. fucking limbs how do they work, i never know what way i have to make them so they look natural. i have some basic anatomy knowleadge but i cant make it look natural

pic related