Agree with Harvey.
Revision 01 is great, especially the head.

I read the orange thing as a gun holster, in which case I think he would look better with just 1 (Han Solo style).
Shoulders have some strange lumps going on, should be simplified and squared-off IMO.
The band on his right (our left) forearm is a little chunky for my taste since it looks like it would slow him down when drawing his pistol.
Yes, in my head this guy mainly uses a pistol because it allows for so many cool hero stances and animation

Legs obviously need work. Skinny legs is a good idea but perhaps at this lo-res they become almost sticks so try for straighter lines or the extra pixels just stand out as protuding lumps.
The feet could use a few extra pixels even with skinny legs, make the base of the foot a bit longer.
In this stance it would be weird for both feet to face the same direction, try having one facing towards as and one facing our right.