I think the house is beautiful but 2 things....
1. It doesn't give me the haunted vibe. Try shooting from a different angle or something to change the mood. It just looks like a big house right now.
2. I hate the vignette. I don't feel like it adds anything. If you want to take a dark photo... shoot at night. I don't know what the available light there is after dark but harsh shadows would give you a more spooky feel. You can also add a model to the photo to give interest and an ethereal sense.