The flowing linework and upright pose are very elegant. Her serene yet confident expression is what sells this art as a lovely depiction of a slender form. My favorite aspects are her hair colour and the swirl motif used to depict her nipple. The only improvement I could see is in the hands and feet. They don't necessarily need more detail, but they feel like they could use more of that unique stylistic design touch that you used in other parts of the work. Well done!