Artist Mike Skidmore has contacted HAF via our website. He is a professional portrait painter and runs both weekend workshops and online courses in oils. He has produced a 1hr tutorial video that is entirely free, and is meant to give real help on subjects like glazing, hair, mixing skin tones and painting reflective surfaces such as glasses. There are other areas covered too.
The video is available from his website http://www.mikeskidmoreonline.com on either the online courses page or workshops.