This is not bad for one of your first. I still have this issue myself when doing gesture, but watching different methods makes me more accepting of the things I do. I recommend taking your time. Maybe 5+ minutes per pose just so you can focus on each line of the pose.
Secondly, try using a smaller brush.
Thirdly, watch some videos on different peoples process. I recommend: Michael Hampton, Proko or even Love life drawing.
Keep up the good work. Looking forward to seeing more.