Good use of shapes
I like the way this one works out, with there being one main outline around the whole picture and everything within that outer line is just detail. The way the main girl's arm makes up the jaw and face line for one of the background characters is clever and the effect is pleasing.
The character to the right of shot appears to have too much neck hidden away, as her shoulder seems to come out of the base of her skull, as opposed to there being a discernible neckline... or is it the same character on the other side, just her body continued? Wow, that's impressive, as there's the whole question of what you see, a vase, or two women facing one another. Now that I think about it, I can see both, which is freaky.
I think that the crowning glory of this piece is probably the hair lines that you've used, as they can lead so easily into something else and mess with our minds, as a result, thus making us consider perhaps a little too much about the piece.
[Review Request Club]