Practise of Life Drawing from Pose Photographs with Graphics Tablet

Today I have been practising using my graphics tablet for drawing poses. I think this will be particularly helpful for improving my general animation skills as so much work is done with this tool now. The following were each roughly 3 minute sketches.

I am also noticing that my technique in general is improving greatly sice the start of my life-drawing lessons. I am free-er in my style, using more curves rather than straight lines (though this can still be improved) and am more confident in my strokes. I'm also trying hard to concentrate on three key things:

The ESSENCE of the pose
The FORCE in the pose
PERSPECTIVE and PROPORTION