Funny! I love the face you chose for Jimmy Stewart's character. I would love to see a recreation of one of the scenes where he is holding the door open for Harvey to go through - it would be neat to see "ghostly Harvey" there.
"In this world, you must be oh so smart or oh so pleasant" - I see you have found a way to be both with an MOC!
Good job! It's always fun to see a builders rendition of a certain idea in LEGO, and kudos if you use special effects, like here! I assume you made the "ghostly" effect with the technique that Disney uses in their rides, such as haunted houses. Where light is set on the figure of the object, then reflected on a mirror in a parallel room... Or something like that?