Close! Try adding the "edges" of his lips to the outer edge of the cheek balls, and try giving that tail more of a wiggle to it than just a rotation. You're trying to make it look less stiff, aye?
...and on that thought, perhaps some more of a full-body inflation before the thing pops out so it feels more uh... trackable? I'm losing the word I want here so hopefully that one gets the idea across. It's a followthrough thing, the turret kinda pops out after a moment with a lot of movementless space inbetween that makes it hard to connect the breath-holding with the pop.