Thanks for your help, wow, nice photo and interesting technique!
I tried to capture the face just slightly blending with the dark background so I took the photo in total darkness on a black sweatshirt while hand holding a candle in order to achieve the desired effect:
Basically it's an image of Mother Mary painted on a pebble.
Maxing the blacks didn't work because the image was pretty dark already so I thought of applying an ND filter on the left side but the candle was still visible. So then I saved the image and applied the ND filter two more times and BOOM, it worked
I would like to know if there is a different way to do that because applying multiple ND filters and saving is not very convenient