, msen sledge redline.png
Okay - first time red lining, so I can't guarantee it's perfect, but I wanted to give it a shot.
You have the movement right in your pose [which in my opinion, is paramount], but you're missing a few studies of anatomy. Because his left leg is closer to us as well as moving away from us, we've got to use foreshortening. Also, the back is always what I like to call 'attached' to the arm through the shoulder. I can't tell you exactly what I mean by it, but the back moved with the arm, sort of. In your picture you gave the ribcage almost a concave shape, but it's really quite the opposite.
For the spy, I'd say just make his neck longer and his shoulder more relaxed. I don't think you'd be able to see that line where his arm is underneath, either.