I think a more sepia color who make the feeling of the composition better. Currently is a bit too yellow. Glad you were able to include a nice shadow on the side. This helps to give you a feeling of the shiny surface of the metal on the vehicle.
This looks like a great picture, and a sweet car for sure. The only drawback for me is the colors chosen for the duotone. There appears to be an overall yellow hue which detracts from the scene.