yea, that is a cool building spako, i like it :thumbup:
If you want to add a ghost there are a number of ways to do it, the simplest of which is just to cut out a figure of a person using the polygonal lasso tool and paste it on to the image. Then set a low transparency level for the layer so that it barely shows..... you could then soften the edges using the blur tool. Another way is to create a layer mask for the figure and blend it into the image.
You should try yourself... its a great technique to learn and comes in useful alot for other things. If you dont want to, I would be happy to do one for you.... trouble is i dont have any good images of people, that could pass as a ghost..... and googleing for one is cheating! .... so if you have one you'd like to use, post it here... or pm me and send it directly to me.