This is such an atmospheric image. The light and shadows work very well together. The only criticism is that the shadows appear blotchy when enlarged. Perhaps some selective burning would help?
A great capture. Gizmo is a real cutie! I love how Gizmo is lit from the window providing good contrast. If I may, I do think the shadows could be blacker though. But you would have to be careful not to lose the graduation into the shadows. Perhaps as Chris said, a little burning.