I also started using a 2mm mechanical pencil as recommended by Proko. Amazon had a discount this week so I couldn't resist.
This was supposed to be a 15 minutes pose but Adrian our host came back from the kitchen after 5 minutes and told us there was only 1 minute left ;-) I didn't frame that one very well so it is good I didn't have time to finish it
And for the first time I also started using a Conté charcoal, also recommended by Proko but I had no idea how to use it. I think the paper's grain was a bit too heavy. I normally work with newsprint but ran out of paper and my favourite store in Soho just closed down.
This was a 50 minutes pose but one model moves after 25 minutes. Couldn't get the woman on time before she moved to the bottom right of the drawing.