That’s really a very poorly set up photograph. Unless William had just spilled something on his pants. Photographer should have stepped to his right a foot or two as well. Presumably they wanted the painting in the scene, but they should have lightened it up a bit so it would be recognizable if so.
Almost has a look like it is a very rushed photo.
The main object ofbit was the portrait of a king that had reigned along time...you can see it was done to frame them all within the lights with the portrait clearly seen between them
They got exactly what they wanted