this is an other great work (particullarly it is my favorit)
the lips, nose and eyes are really expressive and the hair are wonderfull, a lot of movement. your use of this white backgrounds permits to put at the first level your subjects. usually the white backgraound gives a sence of unfinished and, in watercolurs, plays a diffucult role in balancing the light/shadows, but in your case I think that the subjects of your works are full of light despite the light from the back.
I'm curious to see one of your figure with a coloured backgroubn (I don't know if you have one on DA).
ciao, e: bravissima