We can only share album to another user right now. It will be great to share single photos/selected multiple photos from Face/Camera/World Map, etc.
Creating album from Face/Camera/World Map would be great too because it is almost impossible to select photos from Photos(I have over 20,000 photos there).
In long term, I hope we can search/create album/share by various criteria, e.g. some from Face and some Camera and some from tagging.
Thanks for consideration.