Looking really good and clean, but the lighting is a little boring with that kind of background presentation, also the rim texture could need some work. The side looks like a racing tire but it has a pattern with grooves in like a usual tire. The worst thing is definitely the background, try getting something a lot better there. Car renders are IBL renders, so why not use a hdri as background ? Also do not use pure black in a diffuse, else you wont get proper shadows and highlights
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