[superwes88]

These are interesting renders friends_abhi, and since it's your first car, I have to compliment you on finishing it and paying attention to the scene, instead of just rendering the car in a white space.
Some tips:
Look at a picture of a real a3 , and render your a3 in the same angle, and try to spot differences and inaccuracies, and even forgotten details.
Always pay attention to the shadows, your second render hasn't got a shadow under the car. It makes it look like it's hovering above the floor.
And ofcourse what the others already said.
Keep up the good work.