Hi all, how to beautify the color to produce a car using photoshop. It appeared solid color car. Thanks..

not quite sure what you mean man. Really you can't just 'ask' how to do something and expect it to be amazing, it takes a lot of time.
By the sounds of it it sounds like you've tried some brushing but its come out all matte and flat.
You need to use the 'Dodge' and 'Burn' tool to create different shades in the car, then add reflections from the environment.
Take a look in the advanced and elite showrooms to see how they do it.

The dodge/burn to create different shades is not always good, as it sometimes creates a completely different hue/depth in paint.
This is why you use a Paint donor, so you can use the eyedropper tool on the different shades. This way you get an almost exact match of the colour you want.

But im not sure i completely understand what you mean Advan...