Looks good, i like the idea. On the lights, it really depends on the mood, if you want it to seem spooky maybe have it all at night time with some faint moon light coming through the window.
Also I personally would avoid having the window light crossing over with the light from the overhead lights because it might make it seem cluttered, too many lights!
For the sun directional works really well, for the other lights maybe some area lights and point lights. Possibly experiment with lighting from textures?
Its really all about experimenting and finding what suits you best