Though this is in more of a woodland setting: left hand, knees and face. I too study where I've been hit, in hopes of not making the same mistakes (though I still do...)
Hand because I use a long gun and the first body part of mine in view when I turn a corner is my left hand on the foregrip. Knees because I crouch when I should be going prone. Face because I have a bad habit of putting my entire head around a corner to view the situation.