I've taken some advice to learn anatomy first so I tried doing so.
It's hard D:
Anyway here are the drawings
CnC is wanted

On the second picture his stomach area should be larger. You should draw his body like a sack and make the bottom part fatter.

These are nice, keep practicing man, they seem really stiff so try doing some gesture drawings, you can learn more about them from proko on youtube

Were you drawing with reference? Some parts you've drawn rather disproportionately, especially the second drawing.

Gesture drawing might be a good idea if you want to capture the form of a body without explicitly going into the details of each muscle.

looking good. If you want to improve in gesture and anatomy just load up pose-maniacs and do some long 30 seconds drawing sessions. like 3 to 4 hours a day. trust me, after like 3 months of doing this, your hands would literally develop minds of their owns and gesture and stuff become second nature.