Hey Alessandra, nice drawings! Try not to copy the photo as you see it, but think about the perspective, form and structure that comes with it. Here i attach a photo of a quick structure sketch i hope it helps
Hey! i hope you are enjoying your NMA subscription, its full of content and great teachers. Great Job on the drawing! If i can give you some advice, that helped me when i was starting out, is to leave the rendering a side for a bit and start thinking about form in space. Try to imagine whats the real form of the things you are drawing (the head, arms, ribcage, etc) and how it sits in space. A really good tool to understand this is to do cross contour to describe the form. Think of the form as simple boxes, cylinders and spheres, that combine with each other. Also a really good thing to start is gesture drawing, try loosen it up a bit and capture what you feel the pose is expressing. That is going to make you avoid stiff poses. I hope this helps, and i would love to see more of your work!