I especially liked the palette. I am not able to say what can or can not improve, it is excellent for me.

Great shading, particularly on the ruff and her midsection. The anti-aliasing is good in some places and questionable in others; a good idea to keep in mind is consistent width. It takes some trial and error, and your eye will get better with time, but try to design your AA to preserve the shape you intend your design to take. With high contrast like that of the blue patch of hair, you want to make sure that the bright parts are not broken by the darker parts, as that will ruin the smoothness you're going for.

Good piece overall. I like it a lot.

Really awsama job! great color choice and placement matee