I have altered the upper profile of the face considerably to better resemble the subject. I have been unhappy with that aspect for some time and decided to 'bite the bullet'.
I used a quick drying white under-paint, tinted with a little colour, on the face edges and in the stronger colour of the background. It has the effect of making a 'hard edge' which makes him look almost superimposed, but this will be negated once it is dry and I make minor adjustments by adding better shadowed flesh tones over the top. The left photo is from yesterdays post and the right photo the adjusted one. Naturally very minor adjustments to this will occur as I continue to work on the details.