Completely stuck, any help without spoiling would be appreciated. I am attaching the metal notes I have discovered so far

Discovered about 21% of the truth, I feel like I have explored everything that is accessible to me. Don't know how to open most of the locks in the hotel either, not sure how to progress now. I would also like to add that I saw the patterns left by the woman painting and the ones on Lorenzo's business card, but I don't know what it means. I also saw this name "Nocens Mulier" being mentioned in the back side of a notice on the noticeboard. Any leads regarding how to progress further would be much appreciated!