Good news: You don't have to pay money or restart your entire game just to get a scene you missed in the gallery. We've already implemented a feature that allows you to unlock scenes you missed by going 'back in time' with an old save.
Just load up an old save and go check out the mimic scene. Make sure that you have enough Stamina so you don't get a Game Over, and you'll unlock the scene in the gallery in your most recent save!