Kim:  I believe that Katy Perry's picture play is a running play, based on her song "Rise", and is designed to pull in the Corner Backs and Safeties.  It probably signals the next play, not the current one.  Or possibly, it's a matter of how the picture is held?  In that case, is it meant for the opposing team to think that they can "read" the play?  Then to play according to their defensive posture?  Lots of "mumbo-jumbo" involved in calling plays.