At first glance you can see that this piece is a simple drawing of a maid with a dustpan lifting up a curtain. Notice the rendering of the wrinkles in the bottom of the curtain and how revealing the bricks underneath adds a layer of depth which makes it more interesting. One of the most effective elements of this site specific piece is it's location.
The drawing's location allows for more visibility then if it where to be displayed in a museum. Anytime you evaluate a piece of street art you have to give a few extra points to the artist due to the risk of them getting caught and brought up on vandalism charges. The artist has to pull this off as fast as possible. He most likely used a stencil to speed things up a little. There is a lot more that can be said about this piece so feel free to add on in the comments.
ARTIST: Banksy
TITLE: Maid In Chalk Farm
MEDIUM: Paint on brick