i just used the unlock. I was missing random scenes I might've missed be rushing their progression.
Okay ^^ I miss just some scenes myself, but they're all about other girls it seems (well it's in the page where Zoe scenes are) and I don't really know how to unlock them...
For the others (those with the "Goddesses") you can unlock them through the game easily (like the bathroom, in the Jacuzzi, during the cooking contests, during the movie night, or the little party night) nothing too hard to find but you need to be careful to find them before leveling your relationship.
In another note, I find it quite strange that the dev keeps the old character designs in the scene galery. I know the dev slightly changed his/her style during the development of the game but it could be good to have these changes in the galery too ^^'