the step-by-step file of my Cross Quattro image...

1. the base sketch, done with 4H pencil on copy paper, around 20 mins
2. base colors under the sketch added
3. shading via gradients added
4. light via gradients and overlay effect added
5. coloring the sketch lines in the car colors
6. more shine and rims added
7. final effects and overlay details added
8. finished