What is the back story of the drawing of the two elderly people on Bough?


I had a brief period that I took up sketching/drawing almost 10 years ago which I have not kept up with mainly due to time and life taking over and which I would like to re-connect with some day.  Anyway, during my forays into amateur drawing I was seeking ideas of things to draw..  I came across this image during my internet search and I just tried to replicate a pencil drawing of it.  I like the moment it captures between two elderly people in love.  This, coupled with my desire to tell a story in a song, just seemed to morph into the song called Bough