So as the house is being created, I like to do render tests to make sure its going in the right direction. I'm using a directional light for the moon. The camera is a real camera. The "lens" distorts the rendered image and there is some slight darkening in the corners. It gives the rendering a subtle realistic effect.
I finally got around to designing the ghost. Its like a cross between Casper/old-school and Squidward from SpongeBob. It sounds weird, but I think its close. I did some tests with cloth FX and got some decent results. I'm still playing with the surfacing.