You have done some really nice figures. You need to work on hands and feet. Line-of-Action (L-o-A) has a section on hands & feet. Being able to draw good hands & feet is a great plus to your drawings which are even now very good. I do not know about your knowledge of human anatomy is at this time, but some time spent studying human anatomy both - muscles & bone structure could be in the long run helpful. The internet has free information on these items. Also, you should check out: Pinterest & On Air Video. Whatever you do: Remember practice makes better. So get practicing.
These are actually really good,. Except the one on far right, it's missing some features