nice photograph
i think it's interesting the way you shot from the back to include both the subject and the reflection, but focussing on the reflection in the mirror! i shot a similar photograph of a little girl having her hair cut on CNY eve..
it's a photo that relates to the person being photographed as you can see the reflection (what the person sees when he has his haircut) and also relates to the third-person perspective..
it might be a little cramped visually, but then again reflective of the arrangement of quite a lot of the old-school barbers
which i like!
the black and white can be improved upon though, i feel. have a better/smooth gradation between the darkest and lightest point.. makes it look more real and stunning/compelling..
good work