As someone says earlier all imgur link are randomly generated , so don't bother looking into a "secret meaning" just because one of them vaguely look like "discipline" .
And are you all familiar with Occam's razor ? Sometimes the easiest answer is the right one . In this case the second page being the last ( I mean , the page litteraly tell us the game is over ) and the number 9 being a countdown of sort ( since someone pointed out that the imgur for it was created exactly 24h after the post ) .
I see all those far -fetched theory with the twoo or the smile but haven't you all just considered it's there just for the "spooky" feels ?
Sorry for killing the vibe but this guessing game seems overcomplicated for me.
edit : missinge word and spelling