In the current version, there's not too much to do. But hmm, which pictures are you missing? All of them should be accessible, but only the last one is from the club activities.
The third and fourth from the top. Natalie is leading an exercise class and the next one in a restaurant. And in the club is there a rank above Bar Master?
You haven't met Serena then? She's at the town bar during week nights. If she's not appearing, you might need to start a clean game as something's bugged :/ Her questline will unlock researching new stuff for the club and school.
The exercise class is a special scene you get if you turn down Nanako when she's doing the health checkup on you. The restaurant part happens in the intro if you choose the "sub route".