I found this link.

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




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



Step 3: with your CARS 壁纸 and using the freehand...