/ic/ - Artwork/Critique

I'm doing vilppu's drawing manual just now, been figure drawing for a couple of weeks.

Couple of questions though:
1. Should I be drawing the head, hands and feet in detail?
Right now I'm doing a box for the head and planes for the hands and feet, just to make sure my perspective is correct.

2. At what point should I start looking at anatomy and proportions?
These are my biggest issues after perspective, in my opinion reading about them would improve my figures and gestures but I don't want to move on if there's more to gain from drawing models with a 'fresh' view.

3. Should I be drawing the model's clothing?
On one hand clothes will broaden the types of forms I draw, on the other it's just as hard to see through the clothes and draw the body structure.

Thanks.