It would be great if i could play from Harry perspective but still be able to access gallery to review other perspectives that have been unlocked based on the routes i've taken, instead of having to replay from the beginning.Nope unfortunatly not, that annoyed me too, you get a picture from Luca 2-3 Times but nothing more. I would play with all perspectives. That mystery thing works only in the Beginning of the Game after that it becomes obvious whats happening you/MC just cant see it.
Since i wanted to see other perspectives, i also replayed in all-perspective mode, and it's funny how i took a wrong route and forgot what i chose as Harry