Extremely well done shot. While others had similar ideas, this is VERY well done and stands out. Instead of being very dark to allow for the longer exposure, you've managed to capture a well-lit scene with plenty of detail. Great job!
You are not the only one to do this sort of technique, but your choice of subjects, as well as the fact that it is B&W is great. Can I suggest you offer this great pic to your local teenage suicide prevention program and see if they can use it for anything? It is extremely powerful.
Nice shot with a slight position problem, the hand on the shoulder appears to belong to your 'ghost', not the girl on the right, due to the angle of his arm. It might have been better posed with the hand on the near shoulder or just out of sight. Just my 2 cents worth.
I think this is the best one with a ghost in it. the "casual" pose of the ghost does it here, and it almost looks like his hand is on her shoulder. nice job.