Overall nice figures. Hands & feet need work. Line-of-Action has a section on hands & feet you need to go through. The overall proportions look fine. I would recommend you make a study of human anatomy - both muscle and bone structure. The internet has a lot of information on these subjects. You have a very good start. Keep up the good work. Remember: Practice makes better.
Nice work here! I like how clear it is. But u must remember not to draw some things (like feel, arm, hand) too small or thin. Dont be afraid to make them look more "full" (or fat in other words)