For the first picture go to Takoda's route and during the red choice stick with Colt and Jess.
For the other 2 pictures we can knock 2 birds with 1 stone. Simply go through Ken's route again. During the vision with Faolán and Éan make sure you do not end the vision. On the red choice ensure you stick with Ken and Jean. On the final choice of the current route make sure you pick "Best Friends" and not "Soulmates" and you should unlock all the other CGs.