ima artist myself and ur work isnt bad u got skill , and not many ppl can even draw/construct a person anyways dont dout urself , in my experience drawing is about training your eyes to see more and to notice how things are like basic shapes and details, if u youtube mark crilley he teaches very great drawing techniques u even pick up more on deviant art , its what i did and ive been getting better and i dont even needa draw all the time to improve i can view things and just contruct and draw it in my mind. ur work is nice and i like it.