Hello!
I really like your pieces, and your grasp on form is really solid. Keep it up!
However I think you could really benefit from adding a midtone to your color palette; this way, you can portray more nuances in your drawing, as well as expand shading on clothing too. Have a great day!
Hey!
Your drawings are excellent at capturing the movement of the character, I can certainly feel it when I look at them. If you want to improve anatomy with gestures, I suggest blocking out broad shapes of the body (hips, rib cage, etc) and comparing the sizes of these objects with limbs, etc. Also just as important with the line-of-action are the relationship of limbs. For example, if someone were to do a pull-up, their lower body would stretch significantly due to gravity, but the upper body (esp the neck area and such) wouldbe squashed together.
Keep up the great work!