I'm not a great critic if that is what you are looking for, so I will just say what I think.
First at all, I think the girl is placed in an awkward position and I'm pretty sure you know what I mean xD
I recommend to turn her the other way, so she look back from her right side, I'm guessing that...
That pretty much means it's mine hair.
*Pinch the bunny*
Anyway, in a way that is a solid advice to not suddenly touch others hair, some people really hate it. And while does depends on the person, I think if you get the permission, that mean you have much trust.
A hairdresser should be the...