Currently the background of Cecilia is painted black.
This was popular in the 16th century and was not common in Leonard’s time.
Leonardo always draws landscapes in the background when drawing figures. The landscape was usually drawn through windows.
One of the features of Leonardo is that the window drawn in the background grows larger as the times pass.
Probably in this era, the size of the window is a medium size.
I think that some windows were drawn in the background.
Some studies have claimed that a door was drawn on the right hand, but it was not confirmed.
Do windows really exist?
I think that there was a draft of the window.
What do you think?