Thanks for the F1 story lesson... Great work and I am looking forward to see it finished.
I appreciate a lot your infos, so I give to you the mine:
Chiaroscuro --> it is an artistic drawing technical word, and it indicates a particular effect you give to your drawing using ONLY the pencil, that would be 3B or 4B (pencil classification sistem, based on the "hardness". They are scaled from the hardest-9H to the softest-9B. The 'H' stands for hardness, the 'B' stands for blackness, and HB, in the middle, is for hard and black pencils). Normally the HB is used for the sketches (it's easier to delete its signs) and the 2B is used for the shadows.
Sorry if I bored you
ops: .
CYA Dario