First I would relax the 1st 2 fingers of his left hand. Try holding a pen in your hand as if it were a cigarete. The natural relaxed state of the hand would be to have the fingers curl inward slightly. And because a cigarete is relatively light, there is no need for a crushing hold on it... so loosen the fingers a little. If this is a "bad-ass Mobster/government dude", he would probably be supremely confident in his abilities. Thus, his whole body language needs to relax. Roll the shoulders down about 5 degrees, bend the elbows slightly, and shift his weight onto one leg. And last, in keeping with the attitude, give him a cocky half-smile, or stern frown. You've an interesting character going there. Good luck completing him.