Knees, shins and a little blue book

 I wasn't enamored with this pose so I just focused on the knees and the shadows.

Shadows and shapes

 Ran out of (say it with me) time.  This had a chance to be a pretty nice sketch.

45 minutes (or thereabouts)

 This was a lost opportunity.  I was having so much fun with manipulating the shadows that I didn't pay as close of attention to the basics.

Gestures with Patience

Scribble, scribble, scribble...
 

As per usual, the long pose

 

I was thoroughly enjoying the beautiful shadows and how informed the shapes and mass of the figure.  Really a nice pose to work from.

Fifteen minutes again

This one deserved more time.  I would love to have gotten to her head and neck in a more meaningful way.
 

The fifteen minute face...

 ...without eyes.  (Apologies to Billy Idol for twisting his lyric)