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While maintaining your client-prescribed camera view can you use a wider lens to get the whole building in the frame? That would really help the composition. Also try to use the camera correction in the vray physical camera settings (click the button that says "Guess Vert"). The model could use a little enhancement, which will help the rendering. In your rendering the stone appears to be as thin as a coat of paint because as it turns under there is immediately a different material. Try to give the stone some substantial thickness. Even if it is really just a veneer, it should still have visible thickness. For extra realism you could vray displacement modifier to give some dimensionality to the stone. If you do, then in the vray displacement modifier use "3D Mapping" and click the "Keep Continuity" button. This will allow the stone to turn corners without breaking at the edges. Finally, at the base of the building you should probably have some paving (concrete or stone); especially where there are any doors.