
Hope you don't mind I took a crack at an edit (it's fun editing somebody else's sprites for practice since one can allow oneself to be a bit detached from the design and approach it with less bias than one's own work hahah). 
Reduced to 15 colors +1 xparent.
Attempted to clarify the shading clusters
Adjusted contrast of helmet to make it look a bit more metallic
Slightly adjusted the hip location while keeping the idea of a stylized proportion in mind. These longer legs will probably make it easier to animate locomotion and attacks when the time comes so that might be a thing to consider?
The trapezius muscles in the original are huge so I tried to define the volume of the detoids a bit more to match.
Clarified the status of the missing arm (in a perhaps unnecessarily gory way haha).
Messed a bit with the penetrating sword's posing. Not sure that was totally successful.
Edit:
Exported wrong version with missing arm oop.
Of course I don't mind! In fact it's very interesting to have someone else's approach on your own work and see how you for instance would make it better.

I think what you managed to do with the colours Is more or less what I was trying to achieve, especially with the helmet. I think
I'm going to work in that direction.
About the helmet: I
love what you did with the red crest, it looks a LOT better, I hadn't considered shading it like you did,
for some reasons, and it makes it look more real.
Proportions: I will indeed consider buffing his deltoid muscle since as you mentioned I gave him huge trapezuis. As for the hips and
legs I'm not sure I'm going to keep this for the final version in my game (no offense I like what you did, don't get me wrong

).
A friend who reviewed the piece I did for the last character I did before this one, told me I should maybe try more extreme poses with different proportions and asymmetry (hence the wooden leg and the cut-off arm and half crippled torso/back).
I think your version of the sword is a lot better too actually, after seeing it, I can tell that mine was too linear (perpendicular to the ground) and didn't look very plausible, and the state of the right hand/forearm in the front view makes more sense since the sword is visible. The guard and handle are a lot more visible which I like.
Haha I see you pitied him so much you gave him half an arm back!

Again I might not keep this but it's a nice touch and I like the gore actually haha. I think I still have to explore ways to draw scars for his shoulder so that it looks like an ancient wound, and/or maybe have a bone or part of the rib cage poke out/show.
Anyway, thank you so much for your review and edit, your time is very much appreciated!

Also if anyone has sources on metals and scars (if there are such things) I would gladly take it! 0/