More examples of diary drawing or pintimento

First I found this video of an animated series of very simple drawings of a hand  that demonstrates the way the previous drawings can remain there and enhance the story of the sketches.
http://www.facebook.com/video/video.php?v=433207129444&ref=mf 

And here's a charcoal life sketch by a Canadian artist Julia Trops that makes me particularly sad to be missing the life drawing session on my course. What is also lovely about this drawing are the hints of colour.

 And then here's a drawing by Giacometti which shows exactly, in the hands of a master , the process of searching for the line and form can in itself be such a powerful image.