As I told you a few months ago, I'm not adding features to v1.
You go back to the main menu after the end of the session or mid session, and the pic browser appears with the bookmarked pics. It tells you, in a popup, "You have bookmarked pictures. You can now browse through them and add them to lists. Your bookmarks will then be discarded once you exit this browser."
So do just that and add them all to a list you call "favourites"
I know I could have done it better and that's exactly why I'm making a new one.