I found this session with pastels especially challenging. I found that building up a thick layer of different coloured pastels was most effective in representing the lights and shadows on skin tone, though this took some time so the shorter sketches were not so successful.
After making a study of the model in charcoal, chalk was then added to recreate areas of light and shadow. Then the whole piece was obliterated with chalk (after taking the photo below), and the study made again on the same paper.
Continuing the series of Still life studies, this time the objects have been drawn in blue ballpoint pen, which proves surprisingly versatile in expressing dark and light values.