As someone else mentioned already, I don't believe you are told that you've been given a piece after completing the harp section, you just comment that it's a lovely piece of music and move on. I also found the E&B first before even talking to the daughter, so she just took it the first time I interracted with her and she gave me her piece, it wasn't till the end of the game I realised who it was, needs to be a way of stopping us getting the E&B until after talking to her, or having her initial conversation play out even if we have found those items so that it makes sense.
Viewing post in Curse of Aterwood Manor jam comments
Thanks a lot for playing and for your feedback !
Ideally the ending could have been a boss battle instead of only a cutscene if there was a bit more time to make it (which would also have given more use to the lantern shooting mechanic). Indeed, it was supposed to tell you that you've received a piece of the painting, it's a bug that will be fixed in the post-jam version along with some other bugs.
Good point about the daughter's dialogue, it would make more sense if the intro conversation was always played when first talking to her, will fix that too!