Too much shoulder and feet movement. onek already pointed out deep breathing, and the edges, so all that's left for me to say is the awkard rotate/roll of the gun, visible at the butt of it. Smooth animation though :)
I see what you mean about the intense breathing, almost like he as asthma, but I thought he looked too stiff otherwise, I tried to give him a lot of motion which is why is added the slight pop of the feet at the inhale which ended up looking a bit too snappy I guess.
the breathing seams a little extreme to me....very deep and intense, like hes doing meditation or so...... also need some cleaning around the edges
Ah, thank you for porinting that out.
Got rid of the last exhale movement in the shoulders and smoothed out the stock and barrel rotation slightly. Any less motion and he won't be moving at all. -.-