On this one, I made some experiments.
- After duplicating the original image to another layer, I selected and deleted the background image so that the final output will show the person only.
- I inserted another layer between the background layer and the duplicate layer and filled it with white to cover the background layer.
- Then I followed the rest of the steps as stated in photoshopsupport.com.
- I applied the Sharpen filter on the second layer several times, to give additional effects
photoshopsupport.com tutorial, I applied the Poster Edges filter on the second layer then adjusted the brightness to 10 and contrast to 30.
It gave a charcoal effect (sort of)
Thanks to Niña for allowing me to use her photo.