Using a photograph of one of the window dormers as a guide, I created a vector image of the window detail. I didn't want to add too much detail, as in N-scale things are pretty tiny as it is. Though I may go back and try adding detail.
I also started tinkering with the medallion (see yellow below), but I did that freehand sort of (without referencing a photo). I'll see if I can somehow take the actual pattern of the medallion from a photo. My SVG front of the building is still pretty rough. But it's fun to tinker with (and learn how to use) Inkscape.
And for reference what I'm trying to model...