Hi. I am very glad that you liked my works. I apologize if I write something wrong. I don't know English very well. But I’d love to try help. For starters, I would exaggerate the gesture line, so the figure will look more malleable and dynamic. When drawing sketches don’t be afraid to exaggerate. And then draw boxes fo ribcage and pelvis by linking them to the gesture line . Box is your base, your fundamental landmar. Try to save line boxes whole time you’re sketching. Then, when we caught the gesture and tied it to boxes, now it’ll be easier to put the details on the box. It’s also very useful to use references when you don’t know how to draw body part.