Hi Lisa, my recommendation is to try to find the original drawings (facades) of the house to see what the proportion of the windows was. I'm sure the historic board (planners) will guide you in the right direction. Windows were probably made out of wood in 1919 and painted to a particular color scheme to the house. Bronze or brown windows always give the house a nice touch and re much more durable than wood, so I think you are on the right path.
Good luck with the restoration!