Hi,
I like the expressionistic style.
On the sides oif her face, the gray streaks might look better if ithey were more fleshy red, with a bit of blue shadow.
The bottom of her hair that's behind her head is so straight, it should be wrapping around her head. The straight line throws off the perspective. Also, the part in back would be darker, in shadow and maybe that dark line back there is too dark.
The curving floor is a little odd. And she could use some shadows, just something, under her feet that attach her to the floor plane.
Her left foot (on our right) seems too turned to the right.
The eyes could use some lighter parts, the irises look black.
I'd go with a more neutral, lighter background instead of the strong pink. The pink is about the same in tone as she iis, so she isn't popping. Try looking at this in black and white if you haven't already.
To me it looks like all gouache.
The part of her dress that is behind her would not be black, but a darker blue.
Her hair could use some darker areas.
I think you could crop this above the bottom of her dress, so we focus on her expression and hands.
To me it's working well except for some small details. I don't think there are too many