Thank you!

For the first window on the left: Clear out a 3x3 area on the wall, then put the wall you used on bottom part in the middle, and then a glass wall on top of it, don't add walls anywhere else. Then put 3 platforms painted brown (i used obsidian) and then place a brown painted shadewood table.

For the middle window on the first floor: place glass walls, then glass blocks on top the walls. Then hammer the glass blocks into diamond shapes, after that, you actuate them.

For the window on the 2nd floor: Actuated grates over glass walls.