Marilyn - currently being worked on

Here is my second piece of artwork featuring Ms Monroe. I am doing this in tandem with the Audrey Hepburn picture as I like to have at least two pictures on the go as it's good to give the eyes and mind a rest from any one picture as I think you can become 'blind' to certain aspects of your own drawing when working on it for a while. I think it beneficial to put it aside and work on another one, when one revisits the other picture it will be looked upon it with a fresh mind and slight mistakes maybe spotted that would have gone unnoticed if it had been the sole piece being worked on. This picture needs quite a bit more tone adding to the face, but I think it's coming along okay.