The car looks slightly blurry. Don't be alarmed, there's nothing wrong with your eyes.
The next step is to exaggerate the motion of the car by adding a trail.
Deselect the car by selecting the Standard Cursor Tool and clicking anywhere inside the image.
Select the Push Brush Tool and set the Control Panel to size=3, strength=28, style=left slash.
|Using the Push Brush, drag colour from the car into the background. Make sure you are only pushing the colours in one direction, from the car to the background, so that the background colours do not blend into the car.|