I found this link.

Step 1: Get a photo of your car,something medium resolution is good, if the photo is two low then the cars parts will look odd, if its a crazy detailed , the final product will look plus fake. The photo im using is at the bottom of the screen.




Step 2: Go to the cars fond d’écran site-- link and find a car mouth and eyes that suit your picture. It dosent mater if the car is facing left ou right, ou the perspective angle, we can change all that later. for this one i'm using Flo. Open this fond d’écran at the highest resolution.



Step 3: with your CARS fond d’écran and using the freehand...