Script-Fu -> Sharpness -> Sharper -> High-Pass Sharpen
This is a an adjustable script,
that sharpens the high-end/highlights in an image.
Script-FU > Sharpness > Sharpen > High-Pass Sharpen
Dialog
![](images/sharpness_sharper_high-pass-sharpen_dialog.jpg)
Original Image
![](images/woman_PD.jpg)
Result:
![](images/woman_PD_sharpness_sharper_high_pass_sharpen.jpg)
Tweaking results...
![](images/sharpen_layers_opacity_dialog.jpg)
...and usually I tweak the results by opening the layers dialog and raising the opacity of the sharpened layer.