It would really make the albums valuable if we could choose which 4 photos serve as the cover for an album. The system typically chooses randomly and it is frustrating to me because I understand how to drive click through by curating the cover of the album... and the system usually chooses the worst images for this.
Can you give us control over which photos are displayed as the cover?
I don't pretend to know your programming - but based on your current behaviors I made a screen capture to indicate the user experience I imagine. When we hover over images in albums that we own we get the "share" and "delete" options. This new choice could go before the "share" icon...so that it is not too close to the delete option!
The prompt/ hover help could read "set as cover".
:-)