Two minute drawings are always dificult to comment on. You obviously have a good feeling for the human shape, but my own preference is to aim for a 3D form using the natural light and shade of the human shape. Try a two minute drawing of a part of the model's body. Usually the upper arm, shoulder and neck will give you a variety of shades to work with. There are no edges to a human body, merely places where the surface you are drawing moves out of sight, this is not a line, merely the edge of the shadow.
Best of luck for the next set of drawings.
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