Dumb sugestion 1: What if the people that buy the photos online are lesbian/bisexual woman, so when a week (or pay the rent day) in-game pass that could:
- Increace the number of people walking on street, since the more consume of photos resulte in more getting honey and trying to date.
- Increace the chances of rarer photos because some woman start to feel more bold.
- Increace the number of police officers/cameras because of anonymous denunciations from the ones that realize is was themselfs in the photo they bought.
- Micro-games start to get hard since people start to get more cautious.
I think its a convenient way to explain the increase in difficulty/reward.
Dumb sugention 2: One day the Main Caracter notices a girl (since there many pretty girl live next to the MC and it could be used to something) trying to follow/stalk him and the player could choose to do something about it (like, idk, disguise themself or mislead her) or just ignore it.
If the player choose to ignore it, the girl will caught in the act and begins to blackmail the MC, and now the player have to sell all the photos to her with a discount for some time.
That could lean to something else, like a side quest or side lore. Maybe the MC start to blackmail the girl or she becames your personal model or dating some how.