I love this piece because of the body structure and the profile its in. I also like the idea that the face looks incomplete, like it's not really finished yet. I look and this and think, this guy is not really there; he is incomplete. linking to the hidden message which Jenny Saville uses in her artwork.
This is probably one of my personal favourites for watercolour paintings. This drawing just allows the viewer to see the great difference in contrast and tone from the light source. As you can see, the light source piercing through the windows are yellow/orange-ish whilst fading gradually to blue and dark grey. I love it!