The "king" colour of this portrait, like also in almost all your other artworks, is dark-black.Out atmosphere + dress + hair = dark world;In atmosphere + skin = light world.In the light part you use many shadows to design the breast and the neck, but also cheeks, nose and lips.In the dark part instead, you wisely add only few and fast coloured lined, and it gives completly a different effect than the realism of the skin.In this way the two realities, dark and light, create an interesting mix of styles but they both melt in two of the most important elements of a human face : the eyes and the lips. I think that this is the reason because the face of the girl look so expressive and livingThis is a masterpiece!