A beautiful portrait. I love the mystery of it. The iciness of the facial tones merges softly into shadow. The shirt collar's edges meant to be scalloped are now jagged; a nice painterly touch. There is just a hint of royal blue in his suit coat to make it stand out from the dark overcoat. What I love most is the light shining within and around his eyes, as if lit from a source to his right.
I would love to be able to use the same brushes as you did here. Any share?^^