Few things I like about this portrait:
- Colour Palette: Always good to play a colour held by the subject elsewhere within the frame.
- Though a neutral expression, he has an engaging warmth.
- Directional light from the left which helps create form & depth as the light graduates across his features.
(Shot under out-door ambient lighting, notice the reflector in the bottom half of his eyes - used so there's more even illumination, especially eye-sockets & under chin).