@Daniela,
@Steve@f8
Thank you for the compliments.
I was in an exhibition in Paris: atelier des lumières where they beam paints in a huge room.
She was sat there watching around and I took my photo with a relative long exposure, I think: 1/4 of second at f2.
There is no particular technique used. As I said I utilise Ilford Art 300, it's a matte paper and this helps the effect.
I bleached the photos in a bath of ferrycyanide for few minutes and a selenium toning 1+19.
I understood that my more impressive photos come when I have few light, and I m continuing doing that for my style.