I am new to blender so please bear with me if this is a silly question. I have been trying to recreate this cool image and got stuck at the lighting in those glass boxes and the glass shader. Can someone help me with this please.
I'm still not exactly sure what kind of look you are going for (as I said, you are pretty close to the reference already IMO), but I noticed one thing:
You have (physically correctly) used a solidify-modifier to hollow out the glass. The other artist has not, his "windows" are essentially massive blocks of glass. With the solidify-modifier disabled, it looks like this:
Not quite there, but closer, I'd say
Other advice would be to maybe add a little volume scatter to the material and tweak the outside lighting a bit. That's all I can think of right now, hope it helps!