Can someone help me to improve my architectual vizulization,make them apear more realistic, some tips for material editing

[zygisg2006]

[alek.gilot]

use tree behind the camera , so we can see them on the reflection of the glass,
put some bushes on the grass , brake uniforme
use interior paralax for the windows or a light
put a tree , next to your building to cast shadow on your building,
shadow a little bit too dark use shadow local exposure,
sky a lit too expose (hdri reduce background,)
almost there good start.