@guilhermegarcia: Great progress and I'm really glad to see you on this challenge! I find a couple of issues with perspective on the skeleton, try closing the skeleton in a box and, according to the perspective the box you put over is casting, add some lines following that perspective along joints and the feet, where I see the biggest perspective issue. That way it will be easier for you to keep constructing your creature from the skeleton without having more problems popping up in the future
