Personally I think the shading and highlighting are weak. Not enough dynamic in the shading, not enough colour difference, and way too much highlighting.
Her more delicate features like the tone of her stomach, cleavage, or the definition on her neck shouldn't be hard lined, but softly shaded to show the definition.
The hair is very flat and looks like plastic, especially with the hard shading and highlighting.
Her crotch is inverted. It should be protruding outward, not inward.
Someone with hips as small as hers wouldn't have crotch gap with thighs that size.