Enhance the detail
Click on the Detail tab and set the Sharpening Amount to 50. Now hold the Alt key and drag the Masking slider until only the area you want sharpened is shown in white (see below). A value around 70-80 worked for this pic. Now drag the Luminance slider to 15 if you shot at a low ISO of around 100 or 200. You may need to boost this a little further if you shot at higher ISOs to reduce unsightly digital noise appearing.