If you can see a spot in the gallery where they should be, they are implemented in the game. The different CGs in AE050 are based on whether you chose the first choice in back in the third scene "The Lord High Executioner" or not. You can use the debug menu to get that flag in the save file and then load AE050 and it should unlock for you, or if you do have it, load it from a save that doesn't have it.