there are lot of ways of sharpening, here another one:
- duplicate the photo by clicking on top bar and select duplicate, an original copy is made
- convert this original copy to Image>Mode>Lab Color go to channels and select Lightness Channel
- apply USM 500/0,2(amount/radius) and once more a 18/40 sharpening in this Lightness Channel
- select top layer to get all colors in the channels and then the window Layers of Original Copy and drag this to Original as top layer and blend to darken, duplicate this darken layer and blend to lighten
-adjust both blending layers by desired opacity. Here I left both to 100% to see the max result, better result: darken 90%, lighten 40% .
Enjoy