Lovely!. The spiky hair on the back of the head gives this young man a look of speed.
I don't know that it's necessary, but is there detail in the hair behind the ear at all?
Hmmm, wait please ... densitometry on negative doesn't say anything useful. The subjective inspection of print says, that in the room there is not enough light to see anything, so print was not found yet ...
As I remember, I suppose, I think there is not too much detail and if any, then it is not sharp ...
Thanks for comments. He is looking from window, so the back of head is almost dark.
r.