Very good progress man, and I wouldn't expect you to like all my details, after all it's you're work, not mine. I was simply giving you an idea of how I would have done it.
But anyways, as for the sprites.. the back seems a bit wonked in the arm/leg area as far as the shading goes. The arms look exactly like the front views when the shading for it should be reversed. And the legs look good except they could use some shading to show that they are slightly bent like the front views are.
Here's an edit: