Nice work! There seems to be a lighting inconsistency on its left knee/leg. Judging from how everything else has been shaded, I would expect it to be as bright as the tummy or other leg. Other than that, I think it's pretty good. Definitely a marked improvement for you. The smooth and clear shading and features shows that you're becoming more comfortable and aware of your understandings. I kind of get the impression that the rigid pose was used as buffer to cover up difficulties you may have with limbs, but I'll let it slide. ;)
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Keep up the good work!