I originally tried using my computer to edit a picture, but I was having trouble, so that was one of the challenges. I downloaded an app on my phone that made it easier to insert a ghost into the picture. One hard part was sizing the ghost so that it would be believable. This picture has very tight spaces, so the size was a challenge. Once I found the right size, it was easy to make the ghost seem convincing. The ghost also rotated very easily when I was adjusting the size, so keeping my fingers steady was a challenge.