Yeah, ive been playing with old save files. I hate restarting the game as it takes so long to get all the sample and ingredients again. I also dont remember if that resets the unlockable pictures to restart.
Viewing post in Potion Shop Schwesterherz version 0.31 Patreon release comments
I'm afraid that starting over is necessary then. And yes, it resets the pictures as well.
In the future, people who played version 0.3 will be able to continue playing with that file for upcomming versions.
If it helps, there is a small public cheat to use once to give the player a better start. It provides coins, potions and more. The cheat is: headstart.