Central Park West, the road that borders the west side of Central Park, has a wide cobblestone walk along the east side, and ends at a masonry wall that looks to be of great age by its weathering and moss green hue. This is on the way south from our hostel to the subway station at 103rd Street.
There’s the wall.
There’s the bench.
There are trees in the background.
Some of the benches without a backrest, seat TWO people. Some seat THREE.
Maybe Stanley Armour and Madelyn sat on a bench for TWO in the original image?
To add the third person, the bench had to be extended. And that accounts for the bright light between obama and Madelyn’s leg. She was originally sitting at the end of the bench.
It appears the extension to the bench and the wall was made on both ends.
The dip in the wall behind Stanley Armour may indicate where the wall/background was extended.
That’s how it appears to me. Others will probably see more.