— You said that you've backed the glazing. Let those spaces be rooms with curtains. Make the glass more reflective.
— make the reflecting pool [?? on the right?] water instead of flat.
— All the soffits are repeating patterns. Lose this pattern.
— look in the LightWorks archive for a better brick pattern. use a shader instead of a texture.
— likewise the concrete.
— with undersun, the soffits should be brighter - fix the blackness with a material change.
— if you are concerned about the dark foreground, add ambient light, a skyobject or change sun position. Or combine all three.
Dwight Atkinson