help needed (photorealistic render)

[FractalBuddha]

I think if the roof is what matters to you, you should work more on its texture.
What is the material of the roof ? Do you have a real picture of the roof tile ?

I think then with this image, you need to spend some more time with the roof tile material,

are they installed by hand? and what are they made of - I think having them as a mix between a glossy and diffuse material
wouldn't hurt, as they do look a bit flat, and even if they are matte plastic, they still would some a tiny bit of reflection, they probably would have
little rounded edges to them?

Also, maybe the cars are too clean
I Think the palm take too much place. What is important is the roof.

[bicket]

Thanks FractalBuddha

here is a ref pic of the roof. not much to say.
The cars are clean, But if I dirt then my client (a french woman) will tell me that the cars are not clean......

[FractalBuddha]

What is the material of the tiles ?
Maybe you should find a close-up picture of a tile to see what is the exact texture.
Even the bran new tiles on the picture have a litle bit of dirt on them. This give a more non-uniform look, so more realistic.
You could try a distant flat texture of a cloud in the sky to give a cloud shadow on the half of the roof. This will maybe give us a better idea of the material. If you do this, put a picture of a cloudy sky in the background.