anonimoose,
I think I've found why you maybe confused: Your pic of the guy in overalls may be from a hunting mag, but the shooter is more of a rifleman than a wing shooter. He's far from being in a "traditional" shotgun stance. Here's a pic of Kim Rhode, Gold Medal Olympian, in a more traditional wing shooting posture. You can see, her elbows are positioned differently.
(AP Photo/Sergey Ponomarev)