Congratulations on getting through your finals. Here's hoping all your hard work gets you the results you want :)
Your English is very good and you have laid out your scenario very clearly. An interesting idea and I love that your main characters have the arts as a common bond.
Two thoughts. There was once a great youtuber called Quxxn who recommended trying something completely different once in while. It helped to keep the game fresh for you.
Secondly you have just finished your finals and will probably benefit from some serious relaxation. I slept for almost two weeks after my finals. However then home computers were pretty rare and it would be another 17 years before the Sims was even thought of.
So I recommend developing your sims from scratch and gradually building their skill sets and careers. I don't really mind this as I find it quite absorbing and relaxing. I hope you might too. Plus there is nothing more satisfying than seeing your sim gain a skill point or move up the career ladder.
Then you have the perfect base for your story and you can really enjoy yourself telling the story over whatever period of time you want. Finally there is nothing to stop you from returning to other saves. That again is varying things. I find moving between CAW projects and some of my saves works in the same way for me.
