Seriously, who gains if you post but don't make any effort to improve your work? Your guy is essentially the same in all three.
To clarify, Foxhound's suggestion is an exercise, again, "to force yourself to think about each part of the sprite."
Heyguy's crits are also on point, the proportions are way off. Taking both together would get you this:
which, in only 8 colors, can easily be refined to a finished 16 color sprite.