you have an amazing understanding of anatomy and you capture the shapes of the muscles very well. the sketches are simple but gripping and show just as much as you need. the drawings have an alluring emotional quality about them that i really enjoy. if it is within your comfort zone, i would try to perhaps add more details with facial feautres or deeper/stronger shading. i find a good way to do this is to start with a mid-tone (either grey paper or light shading with graphite) so i can add the highlights and shadows separately. you have such potential and i think you could take this very far :)
very good. you have a good understanding of eye shapes and proportions and where the nose goes in relation to the eyes. the lines are quite strong but you could stylise that and make it your signature thing and it could work quite well :) happy drawing!
very good ! really captures the fluidity of the movements and looks like a freeze frame from life rather than a picture that has been posed for (if that makes sense). very accurate proportions but i will say (it might be the angles but) the neck could do with being ever so slightly longer. happy drawing!