A grimace or a frown you . . . .
From behind the chair: could make your client feel like you don’t like what you are saying to them
In the chair: the client may feel unwelcomed or they may be uncomfortable
Making Faces . . . .
From behind the chair: could make your client feel like you have a negative perception of them and/or their hair.
In the chair: the client may feel unwelcomed and/or unsure of how they want their hair styled
Mild Response at the end of the service . . . .
From behind the chair: could mean that you’re tired or busy
In the chair: your client may not like what you have done to their hair
While there are plenty of nonverbal cues to decode, but the point that I am trying to make to all my stylists out there is—FIX YOUR FACE! Look pleasant, be inviting and welcoming in your demeanor to every client you have.