Thanks for all the comments (well nearly all of them!) - I was not happy with the shadow but I could not do anything about it, I tried but limitations within the bedroom prevented this.
It's the negative space, and the interesting shadows it contains, that makes this photo work well. I also like the gradient of the texture from rough to smooth.
A lot of people here aren't fond of symetry in photographs but I think in this case it adds to the beauty of the shot. I love the rich tone of the shot and the soft shadows as well.