Your proportions and the way you follow the line of action are really good!! You should try to challenge yourself more in not passing the line again over what you already made so it looks more loose. What helped me a lot with this is using an H pencil for the base and then when you have the proportions and the pose right use one from 2B onwards so that you can mark the figures you really want to be seen. I hope it helps!!
Lauabaloni