This looks like a good one

Basic elements are here: Yûjirô Ishihara (front & center - with a pistol), Hideaki Nitani (on Yujiro's shoulder just below the scar - with a pistol) and Jo Shishido (the guy in the duster with a pistol who is triple-tasking: shooting, smoking and looking cool). Plus, some guy must've orded a knuckle sandwich in the top right corner...and is that a mystery dame in the lower left corner?