I thought I would try a sharpening technique that reduces the haloing effect Kort mentioned then adjusted the shadow and highlights since I had never tried that before.

Sharpening.
Image>Mode>Lab Color
Select the lightness channel.  Its in the box with layers and paths
Apply Unsharp Mask w/ Amount 100%, Radius 1, Threshold 4 OK this
Ctrl F twice.  applies the mask two more times
Image>Mode>RGB
Shadow/highlight  shadow 80% highight 10%.