Poll: How to unlock a scene

Hello friends.

In the gallery for the most recent mods, scenes aren't unlocked by reaching a certain point in game but by having seen a specific image. While being a strict improvement over the previous method, it creates the problem : how do you choose this image ? Some scenes are more complex than others, sometimes they can be cancelled or include CGs that are only available under certain conditions. 

I've always tended towards unlocking a scene only when it had been seen in its entirety. 

The pros are:

• It's more rewarding this way ;

• It lets you know if you missed something important ;

The cons are:

• The scenes are harder to unlock ;

• You can see most of a scene and not unlock it.

I've improved this by adding the unlock feature and hints to the gallery and I'll add a notification when a scene is unlocked in the next update, if I have the time. Still, I'd like to know what you'd prefer ? Should unlocking a scene be easy or hard ? Straightforward or rewarding ?