Seem to have forgotten how to represent tone in short periods of time.
First some 10 minute poses using line.
Long pose an hour (with some missing shadows).
A long drawing about 2 hours.
There are two 5 minute drawing here and two 10 but one of each on each page.
A couple of 5 minutes.
A 20 minute pose, I just had time to draw the outlines of the shadows.
Long pose 20 minutes, some shadows drawn.
Some 10 and 15 minute watercolours and water soluble pencil.
About 1 hour coloured pencil and then charcoal.
Thanks for looking.