Life drawing - 2nd session with Marie

I first drew Marie during one of my early life-drawing sessions back in May, so I'm hoping that these drawings will demonstrate some improvement since then.

The session started with a couple of very quick (three minutes) sketches in different poses, folowed by one of five minutes. I used charcoal pencil on white cartridge paper for these...

Then followed a crouching pose of 15 minutes, for which I chose Conte crayon on coloured paper. This was a tricky pose with both the head and most of the arms hidden from me, and the stool she was leaning on was covered in a white sheet. I decided to focus on the line of the spine and buttocks to anchor the image and then build out from there.

Finally, we did a long pose of nearly an hour. I stuck with Conte crayon and tried using the white and grey crayons more extensively to pick out the lighter parts of the body. The left leg and knee gave me a bit of trouble for a while, as the knee was pointing out at me and the foot was tucked under tucked under the right leg.
While there is obviously more work to be done, especially on hands and feets, and getting a better facial likeness of the model, I think I can see and improvementover the pictures done in May....