LOL, I think in some cases, a Steadicam would make your still photos even worse. The Steadicam works the best while you're moving, not while standing still. The Steadicam is for "flying" the camera around while running, walking, going up and down stairs, walking backwards, etc.
The whole rig needs to be balanced, and it's on a gimble, so if your hand moves (or the arm from the vest moves) the camera system itself doesn't wobble, but the gimble beneath it will rotate/move around.
I had one and operated one back in the early 2000's with a now VERY obsolete Sony Mini-DV camera, and it's such a great device. Very fun to use once you get it balanced. But yeah, it's for MOTION PICTURES.