Here's the finished exercise. It was meant to be done all in hard pastels, with a view to learning how to create the tonal structure to paint over in soft pastels. But I only have a limited number of hard pastels. I feel a shopping trip to Details in Newcastle coming on.
I enjoyed working this way - it sounded similar in some ways to the tonal underpainting Mel did in acrylic glazes over grisaille.
Anyway, I didn't expect to enjoy this, I thought it'd be a chore. but I'm looking forward to getting home after work & getting my teeth into the next exercise.