Oh goodness you're a lot better than me. Maybe practice hands and feet more? I think you're a little less detailed in your rendering of them.
I can't speak to your technique, but the left calf looks very short. And the it looks like you struggled with having an even level of detail in your shading on the darker side of the figure. It probably should be at least somewhat less detailed on the dark side, but I still think it looks too flat.
