None.
The image above is an old photo taken before we knew how to properly take pictures of Woodward's chalk drawings (pastels). You can see fairly dark shadows cast over the painting because you cannot point a light directly on the pastel being that it is kept under glass. The chalk drawing to the right is an example of a similar, November scene, without any shadows.
"E. M. Logan Studio, 28 Vernon Street, Waltham 54, Mass."