("No cheating, I promise. How long time do i have?")
You have 24 hours until tomorrow. Just do as you're told and I collect the pictures tomorrow, together with your story on how it went.
I promise to use the pictures discretely if you only do as instructed. Have fun!
(I rolled for the first picture. Was it time to take the first self picture? Would there be people watching me as earlier times without me seeing them?)
[Only proceed when you have rolled and are ready for flashing! If not, come back with a die and a camera with a timer function! You may also use a virtual die: http://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks1/maths/dice/six.htm]