Its hard to sum up the beauty in this picture but heres the best I can do.
The way you drew the faces all connecting is very inspiring. I love how you made it that the hair becomes some part of the other connecting faces. Even for just a test sketch this is truly magnificent. The facial expressions are a mix of both worlds of realism and cartoon which is hard to come by. As well as the shading; simple yet just about enough to complete the faces. The part that caught my attention would the eyes; which tells me so much about the woman you drew. The eyes are indeed a window to the soul.
Looking at this piece from now on will always give me a motive to draw. Thank you