Hi Nato. One thing that stands out is the arch of bricks over the rounded windows. The gaps are too big. These should be tight together, especially at the bottom, as this is how an arch gets its strength.
If possible, I would recommend adding more "3D" elements to the buildings architecture. Like pillar or brick work detail to the front sides. Also ledges between floor levels. This adds to the city effect and is alot more interesting when painted and finished.