Enhance your photos by using the High Pass Filter:
- duplicate the layer that contains your image and make sure it’s on top of your original (drag layer onto layer icon in the Layer’s Palette)
- select the duplicated layer and go to Filters > Other and choose High Pass Filter
- choose a value using the slider (I’ve used 4 for my example)
- change the Layer Mode of your duplicated layer to Overlay, Soft Light or Hard Light
Afterwards you can always decrease the effect (if needed) using the transparency slider in the Layer Palette or you can mask certain areas to keep them from sharpening. In other words it gives you total flexibility.