I would have worked more on the exterior but the point is that there is not enough space to add more stuff because of the wooden stairs which I think look pretty good.

Also adding different materials on the walls of the tower wouldn't look very good I think.

If you want you can give me some ideas to improve the tower but unfortunately I won't have time to add them cause tomorrow I fly for Italy with my family so I think you understand that I won't have enough time. Now I will return next week and then if I have time I will work on the tower.