Where can you find the 15 missing photo pieces in Professor Layton and Pandora's Box?

See the related link for a walkthrough that shows you pictures of where the photo scraps are

Look down the right side of the walkthrough for a clickable Photo Scraps index that takes you directly to the location of each of the 16 scraps

Not all of the scraps are found on the ground, with some being received after either solving puzzles or talking to characters

Please see the Related link below for a walkthrough of the Photo Scraps.
on the floor