Ok the first thing I notice is the model is a bit lumpy and untidy in parts. With a bit of practice and experience you should be able to iron out the problems pretty quickly. Maybe watch a few modling tutes just to get an idea of the workflows and processes of modeling. This site has some good videos that explain the theory behind various modeling techniques.
Another obvious problem is the texture on the tyres and to a lesser extent the ground. I'd suggest looking into uvw mapping and texture placement.

Also, did you use the default scanline renderer?

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hey thanx...4 d suggestions...ya ill go thru d modelling tuts....i used mental ray renderer...ya i dont noe much abt uvw mapping...il surely learn..any oder faults??

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