This technique is called digital painting, are many tutorials on the internet, I do not know if there are on cars, if by chance you find it, can you give me the link to me?
for now the best part of car and painting is ragistration place. if You do rest of the car in this style it will be nice. but now, all painted parts looks... hmm - strange.
Toyota MR2 - done ||
Acura NSX - done ||
Chevrolet Corvette - 9% ||
Honda Civic - done ||