I have been trying to paint heads without using white and just glazing primaries. I'm not sure about the black under-paintings........too dark? Maybe use it very thinned or a terre verte or cerulean perhaps? I've learnt that maybe you should really add some paint to the oil, too! I'm not sure it will ever dry, so will have to tonk it. See 'Steph'. Although I do rather like her ethereal quality, aka pale.
Alan 20" x 16" Oil
Alan detail. Too much red on right side of face...............scrape that off or darken everywhere else?
Steph 10" x 12" Oil
Steph detail. I have zoomed in close so that you can actually see I have used colour!
Love how she still stares at you, even from a very wonky photo!