Figure Drawing

I think the hardest thing to learn about drawing so far has been setting the initial dimensional limit and sticking to it--getting the proportions to fit within that limit with no fudging. Second, to get the width correct relative to the set vertical limit (I tend to lean towards making things too wide). Third, incorporating the subtle nuances of line and edge quality and such, which is rough water into which I am just beginning to navigate. 

But there I go trying to rank all these aspects of good drawing, when in reality, every little part of it is incredibly challenging and inseparably related (which is probably partly why I find it so irresistible--I do love a good challenge :).