It looks like it might be getting too thick in some areas and that the secondary forms of the anatomy are stiffening the pose and overpowering the primary forms. I would consider taking a loop tool and removing some of the secondary forms as well as really focusing on the outline. For example from the back view there is a distinct transition between the lower back and the Latissimus dorsi muscle but that transition doesn’t appear to be as apparent on your sculpture. Really try to get the gesture and silhouette established before you start to develop the anatomy.