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A lot of ways to do that. The guys have outlined some of them.

Unless you want to try the straightforward approach...

Create a new layer .... With a large solid brush, Paint over the areas you want completly jetblack or whatever background color in image.  On a new layer and with a slightly smaller brush set at minimum pressure and airbrush , Spray in the faded parts. adjust opacity to r taste.

Final retouch with eraser tool (in your image - around the nose) ,  Blur tool, Add in extra effects.... .