The one on the top right is the CG of Shuu and Haato playing with the stray cat. In order to get it, you shouldn't have a pet. After you become lovers with Shuu, you have to spend time with him in the restaurant to trigger the scene. From what I gather, this event happens after Haato and Shuu sees Shuu's uncle in the restaurant.
The CG below it is the one where Shuu drops by Haato's fanmeet on December 10. I believe the requirement there (other than Shuu must already be your lover) is that you must be famous enough to have a fanmeet by November and maybe calling Shuu the night Tocchan tells you about the fanmeet/the night before the fanmeet helps.