Your progress is pretty impressive, and I am inspired to improve my skills more. The only thing I would suggest is that as your gesture improves, I would suggest loosening the arms and legs a bit, using straight forward limbs seems uninteresting, so try to make it look like this.
It will improve your posing a great deal if you do that. While volume and shapes are important, a consistent and fast gesture is much more interesting to grasp, and if you draw the base form, maybe you'll have time to add small details, like fingers or faces, etc.
In any case, keep up the good work.