I have a rubberlike texture. If you play with bumpmaps you might be able to create more realistic tires. To make a darker shadow you should turn down the ambience of the object that receives the shadow. you can also take the lightlab and turn shadow intensity up. that way you get darker shadows. If you can increase metallicity than you should do that. This makes the original color of the texture shine through. At the moment the original color of the car isn't visible anymore at the side of the car. The chroome parts are perfect. you might want to make a different sky.

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