very impressive work, if i may , maybe the skin is a little too shiny, it creates a kind of mask, wet film on the surface. regarding the hair, yes I understand his disappointment, the style is not very modern and can also be a little too shiny too, the glasses are too big for his face.
the material of the leather jacket looks very good.
did you know the work of Jacques Defontaine, perhaps he could be a nice reference inspiration.
https://tkio.artstation.com/