I think to achieve curved roof the best source yo accomplish this would be using the Archimedes two plugin it will allow you to create a more curved object. And then you could make tiles by parts or meshes and rotate them different degrees to achieve a more decent look whatever to your liking.
Maybe add some small windows and putting like flags or small holes in the wall could be a nice addition to be placed down, if your looking or needing ideas.
A good thing i find helpful is using reference image when finding a roof design or different items you want you should angle, center the bricks some of them look a little odd. Here is a tutorial that’ll help you creating different curves i would recommend checking it out if ever needed: