There seems to be something wrong with the subtitles. I typically use English CC; and when watching from 1:18 it doesn't seem to make sense anymore, because Dorian explains shading the Asaro head while crosshatching little demo squares and that doesn't fit together. With English (Auto-generated) CC it makes more sense, these seem to be the correct ones.

Sometimes shadow areas contain a lot of visual information; we should assume this is all caused by reflected light and ambient occlusion, right? Something like "shadows inside of shadows" doesn't really exist?

Very interesting assignment! Here's mine.

This was trickier than I thought. Quite fun tho :D

Here is mine, painted in Photoshop.