Uh-oh

In the piano room, I placed each picture as I found it........played the tunes back as I went. Only thing is that after I placed the sixth picture and played it's tune, the eyes on the face above the door lit up and the door opened. I went through the door OK, but am wondering if this isn't gonna hurt later?

No, you're fine. Once you leave a chapter, it's done.

There is one picture at back which, when placed, will always make the eyes above the door flash. The door will not open however until all the pictures have been completed - regardless of the order in which you care to do that.