I tried to do some of my own after this demo. The likeness and proportions are definitely not there yet, but I do think that I got the understanding of the loomis head in 3/4 view down. Any critique or tips are very welcome!

My attempt at the assignment. The highlights in the drawing with the pear might not be the clearest, because the pencils that I used were not that dark. I used darker pencils for the portrait one. Critique is very welcome!