Alright, I'll try to be as objective and constructive as possible.
First of all, I can tell you that this piece was worth the time you spent on it, really. The improvement at every level is obvious and pretty impressive, particularly on the anatomy.
The proportions are good. Very good actually, except maybe on one part, but I'll talk about it later.
The upper body was really well-executed, and I love the curve of the breasts and the angle and perspective on the waist.
As for the pose you chose, it was specially delicate to render, since the upper body is bent forward, which involves the use of perspective for her lower body part. I mentionned the waist earlier and it's what that gives the most the impression of depth on the body in my opinion, since the foreshortening there is nicely executed and enables the rest of the body to follow naturally.
Small observation on the left leg though.
Seeing the angle of the body, I suppose that the leg is positionned backward, however it doesn't really give that impression. And therefore, the leg seems to be a bit too short compared to the rest of the body, but I think that this is a matter of angle and maybe adjusting the foreshortening.
A little comment about the coloring and lighting now.
I love it of course~
But I give a special mention for the sketchy effect you gave using hatching. It gives a nice traditionnal touch and fits perfectly in the universe of that anime.
Also, the lighting adds more at the depth of the picture, emphasizing the movement of the skirt, the roundness of the breasts (told you I liked these boobs), the softness of the hair and the life in the eyes.
So, in conclusion, this is indeed one of your best work really. Now I'm just waiting to see your future work on the DA front page~