How to create a charcoal portrait 3

Thanks Simon for your comments. These are usually fairly quick exploratory sketches, not worrying too much about either likeness or expression - they are mainly about pose and composition. If I did however, chance to get the "perfect expression", I would hope to recognise it and be able to replicate it in the final painting. The client and I both agreed that sketch 2 was not the "correct" one; the sitter is a very lively 92 year old who despite her physical frailty is mentally very alert, enjoys talking to people and is very aware of what is going on in the world. We both felt that sketch 3 expressed this better.