If images on a slide overlap, you can control which image is visible in the overlapping regions.
To bring an image forward so that it appears to be on top of another image:
To send an image backward so that it appears to be behind another image:
Note: There are additional sub-commands of Bring to Front and Send to Back that let you move an image to the very front or very back when working with multiple images on a slide. These commands are available on the PICTURE TOOLS FORMAT tab in the Arrange group.
These actions can be repeated more than once depending on how many images and levels you need to arrange.