I got some more ideas down, I tried to use some of the silhouettes that I had created to design some possible buildings. Some worked better than others, I also did a few compositions so that my brain was always thinking of different things.
I like 35 and 40 as structures, although they are very different. 42 as a high angled composition could work once it has more details, like the rest of the city.
I think for me 40 is like a observatory kind of structure, It was created using the silhouette from number 29.
Any feedback is welcomed.