Interesting and challenging stuff you're trying to do here. Good luck with that!
The sprite looks nice, good palette, design and readibility. The forearm on the left is too long though. The hand looks strangely bent, maybe direct it forward instead of down.
The breathing anim is too fast and exagerated, and the rubber bending arm looks weird. I'd suggest making the breathing more subtle, using the colors to suggest subpixel movement.
On the weapon draw, you're trying to show a complex movement too quickly, skipping inbetween stages. You should be showing:
1. Hand reaches back, moves coat out of the way (maybe a slight coat grab and tug to throw the fabric back) to gain access to something on the back
2. Hand reaches behind back, inside coat
3. Slight struggle to remove (such a huge) gun from pants
4. Large arm movement (elbow making a large arc, whole body twists to the right/down to make way for the passing gun) to make the gun not hit neither the coat nor the leg.
5. Aim forward, other arm reaches the gun
The coat throw is too exagerated, making it look weightless, the coat shouldn't fly at light speed through the air.
