Creating a Ghost photo in photoshop.
Step 2Open a picture of a person who you want as a ghost, and make it greyscale (Image > Mode > Greyscale.
I chose this girl:
I made her look a bit more dead by deleting her irises:
Select the Dodge Tool
Choose a small soft brush (about the size of the iris, hardness set to 0%)
Set the exposure to 50%
And apply it several times on her irises, until they disappear.
Step 3Use any selection methood you like to select your ghost, and paste it on the background image.
Go To Edit > Free Transform
Click On the chain icon in the transform menu to lock the width/height ratio.
Now you can move her and change her size.