Here is the burnt umber/turpentine sketch of Rachel King. I usually do a charcoal sketch then go over that with a thin paint brush and paint to fix the image, always refining the image.

My Yoga teacher, Carina, portrait in oil colours, old master techniques

Kristy King close up of head

Kristy King finished portrait

Kristy King portrait first sitting

Rachel King detail of hands

Rachel King portrait finished