- Convert image to monochrome
- Up the gamma a bit, original was somewhat dark
- Duplicate the layer so there is a copy of the image
- Blur the top layer at about a 5 pixel radius
- Remap the brightness of the top layer according to the graph shown
- Set the top layer to "Dodge" blend mode
From here, you might pull the backdrop and put in a blend to replace the background, if that's important to the effect - I'm pretty sure the example image had that done.
In the attached example, the blurred, remapped upper layer is at the left, the original, lower layer is at the right, and the master image (the result of the layer combination) is in the center. The graph at the bottom is what was used to remap the brightness of the upper layer.
Depending on where the darkness of the hair falls for any particular image, you'd want to move the bottom of the "V" along the bottom of the remap graph one way or the other. I hand drew that remap curve, which accounts for the ratty look to the line.

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