This is from one of my many Figure Drawing classes. 20 minute pose.
I remember my teacher saying 'Remember, your eraser is your friend! Use it to help sculpt the shape of the figure!" In detail, you can see the use of eraser in this drawing...
This lovely lady is from some sample comic book pages that I made to get some freelance work in the comic book industry. Can't beat a girl with a gun in that market :-)