soundproofing

I've lined my detached garage with insulation, OSB and plasterboard (drywall) to soundproof it and now I need to add seals to the door. The thin metal door did very little to stop sound and I've filled it with insulation, added two layers of solid wood and finally stuck on some thin acoustic...

I want to sound proof a bedroom window from loud road noise as much as possible (I don't need to see through the window). Sound is not really coming through the walls since they are thick stone (it's an old building). Window is about 1.2 meters square, and has a 0.5 meter interior recess...