Thank you for the kind replies.
In light of your comments and my growing sense of artistic unsatisfaction in any of my work I have spent another hour on the portrait sorting out the areas you both highlighted plus some areas that I wasn’t happy with myself (since I have the reference I can compare features!)
Nose - biggy - changed the angle of the nostrils and reworked.
Shoulders - quite right, they were insufficient.
Hairlines (fringe and beard) - wasn’t like mine.
Eyebrow - wasn’t like mine.
Top lip - got that wrong, too fat.
Reds of the eyes - added.
Small changes, but overall I feel that without hurting the feel of the piece they make it look much more like me (+ the nose is much better).
I’ve left the old one up for comparison.
Thanks again for the helpful comments!