A3 brown paper, opaque white gel pen as well as coloured fine tip markers, 2 1/2 hours.   Next week, I might try a gold gel as well.  If you arrive late to a group portrait session (as I, ahem, may do), only the seats at the extreme sides of the model tend to still be free but  I’m starting to rather enjoy the antique effect of a profile portrait.  Perhaps it’s time to start a series?