I use the gallery as an indicator to how much content I have yet to unlock, but there is no information to steer me in the right direction or even if the scene is blocked by previous actions.
I can think of 2 possible ways to go about it, one being simple text in each locked gallery picture, and the other being a new character that wil act as an information hub for available actions you might not know about.
Is there something in the works in regards to this?