Sooner or later you’ll run into this thing called foreshortening. It’s very difficult to draw poses that have a lot of distortion like this. Knowing that foreshortening is difficult and hard to get it right when you’re just beginning to explore it, I wanted to do more than one test to make sure that the first one wasn’t just a fluke. Don’t expect perfection at first. Aim for “just right.”
I started off with the right arm, then left, head and upward. I imagined the limbs as cylinders.
Check out this folder for foreshortening poses: https://www.deviantart.com/senshistock/gallery/790939/Foreshortening-and-Perspective-Poses