Very candid and yet well taken shot. I really like many things about this shot.
1. how the woman is looking at the three while she's also part of a three! just great.
2. Love the poses.
3. The figure on the right is looking inwards, and the one on the left (the woman) looks away while the middle is quite indifferent/neutral. That also mirrors the relief on the wall which IMO is absolutely wonderful.
4. If you look at the relief it's the same thing. The one on the right is looking inwards while the one on the left is looking away and the middle is indifferent/neutral.

As far as the tones go, I think they do the job well. There's detail all over, even in the woman's jacket.

Very nice shot. .