@ciane, That's funny because I tried all those same wallpapers you did too and thought, oh I like that but that's for another train another time, not this one, lol.
Boy, it's really hard to find just the right window, ya know? I like the looks of the Lunette window, but it sits kinda high for seating, and I like the height of that futuristic window, but I don't like the looks of it. And the Bauhaus tainted windows have too many panes, lol.
So here's one more option and then I'll be done, lol. It's the windows from Uni, and the height and where it sits looks about right for table sitting, but does it look too much like a house window? And they also have the 1-tile version to put in the middle (for symmetrical spacing).
HAPPY NEW YEAR!!!
https://i.imgur.com/P5Zj9ak.jpg
https://i.imgur.com/dkKqM10.jpg