I really like the movement in these drawings and the dynamic strokes. Keep it up :) As for feedback: I agree with @Vincentius Sesarius but another thing (you probably heard it before) that can be helpful is to look at your work in a mirror or flip it digitally. Even if you measure the balance of a pose and do everything right (like Proko mentions in his balance video) the drawing and its forms can still appear imbalanced. I find that flipping the drawing is a good way to spot those imbalances. Hope that helps :)

As far as I can see, you've done a good job on landmarks. Is there any particular landmark that you have difficulty with? Broadly speaking, there's only a few landmarks on body that's worth memorizing: 1) shoulder bones, 2) knee bones (knee caps), 3) base of the back of neck (C7 vertebrae, 4) the wings of scapula, 5) clavicles, 6) ASIS and PSIS, 7) the head of femur (greater trochanter of femur, that bulging spot by the side of our hips). As for balance, there's two categories in figure poses, dynamic and static. Dynamic pose is a freeze capture of a candid movement, like a picture of someone in the middle of running. It's a bit more complicated to find the balance in these poses, because, well, there's no balance in dynamic poses: if we'd try to stop in the middle of a running stride, we'd fall. On the other hand, static poses are more predictable when it comes to finding their balance. If you try to draw a perpendicular line from the middle point of the torso to the ground, the point should never cross over the ball of the foot. A good example for this is on the first image that you attached: if you notice, in your drawing, the middle point of the torso crosses the ball of her right foot. While on the reference, it doesn't.