Very nice work. Love the belt. A great choice of models, as the others have said. Both the face and physique are perfect for Natasha (wasn't she a ballerina at one point? Or has that been retconned? I lose track
.)
I'd actually be one of those boring people who goes on about wrinkles though.
They're not strictly necessary, but I for one like the added realism. Fabric isn't body paint, y'know? They shouldn't be overdone, but they can definitely enhance a manip, imo.