hiya there,
your proportions are coming along quite nicely the figures are all clear and well structured,
id say you should try to draw with singular lines, many of your lines are still sketchy and scribbly, try to make more confident strokes, also when shading use a light touch to skim the paper back and forth quickly so your shadows are more cohesive, try to incorporate more details like toes and the shape of muscles within the body
overall these sketches are really good, keep it up!
