lots of different style decisions going on, what exactly do you have in mind of where you want to take the piece? are you thinking more value such as kof or maybe more lineweight and cartoony such as capcom etc?
i was in a fighter sprite craving, so i made an edit. your piece had some pallette unification going on, and if you even have a little bit in a fightersprite, it ruins the clean ramp rule, so you might as well just unify the whole damn thing and make it look extra purty.
your sprite was so much for me that i lost my craving before i could finish the hand and shoe, youll just have to deal. i really dont have much to say about my edit( i do, but its too much to type, and an artist of your level would already know everything i said and it would be a waste of time) maybe it will give you some ideas. some other ways i think you could take this sprite are to show more volume, like in my edit but with clean ramps so that pallette swaps would work and it would be more in the vein of classic fighters. aswell as maybe focusing more on line weight and getting that comic/ cartoon feel both with pallette unification or not.
edit: btw, dont feel bad if you disregard any bit or even all of my critique, your at a much higher calibur of pixelartist than me so and opinion that you have that contrasts with mine is probably better on your side anyway.
edit2: man, im having way too much fun with your sprite, i made a clean ramped version aswell as a lazy little pallette swap to show it works. now little nooblets can easily recolor it and call it their own! yay!