Hi There
Some of the materials like the roof is a bit flat, an easy way to give a bit more bump
is just to drag the diffuse into the bump slot , It's no normal or displacement but it
can go a long way to give a bit more detail...
As for composition, imagine yourself taking the photo and at your current angle that would be a GIANT : )
Lower cam a bit and look slightly up , but ensure the verticals stay vertical , gives the house a bit more strength and presence
Love the car and cover, well done