Looks to me like you are rotating your arm out at the elbow when all you need to rotate is the wrist and forearm out.(pictures CAN be decieving)
Hold your arm out with the wrist and forearm perpendicular to the ground.Then rotate just the wrist and forearm and notice the elbow position.It should not move.
From here,most coaches prefer to teach a straight but relaxed elbow but if you prefer bend,you should just relax the elbow a little further without rotating it out.
I suggest working on it AFTER killing that turkey