Life drawing with Irina

In this life-drawing session, I tried using a variety of media, with charcoal for some quick (one or two minutes) poses, and pencil for some slightly longer ones.
In the end, I reverted to Conte crayon on coloured paper for the longer 50-minute pose shown here...
I had a few problems with the left arm and hand, and also the right hand, and the result is a bit strange, I have to admit. 

 This was one of the earlier, shorter poses, done in charcoal pencil. Again, I'm not very happy with the result, even though it was a very interesting pose with the legs crossed and the left foot hooked behind the right leg.
Basically, I think I've made the body too long and the legs too short. And the hands are completely wrong. All in all, not very good..I'd have liked to spend more time on this pose as I could have worked on someof these failings.