Here's my take, edited manually. Mostly fixing colors, limiting the palette and few details:
My suggestion is to do a gray render first because with a professional software you can limit the color amount to 7 tones, which is how KoF XII shading is.
Then I suggest to do a render with a color separation, like the ones you do but with more saturated colors avoiding white/gray/black tones. If you can get it to be pure colors it would be excellent, if not, something similar so you can saturate the palette with the professional software.
And then what you do is to overlap the gray render with the color separated render.
Spoiler, click to toggle visibilty
*The extra renders I suggest are for a more accurate palette. It should ease the issue you have with the renders that have 256 colors. Which is a real issue. My example image should have 42 colors tops (6 separations x 7 tones each).
What is cool about the gray render is that you can manually edit stuff here and there without worrying about the palette. And after that you overlap the color separated render or even better you do a custom CS, with the 3d render as a guide.
Also, the textures would be better if they have more glossiness in the hair, clothes and skin.
The last renders you did have a shading that reminds me more of SF3 style rather than XII, the first versions you did were closer to XII, with a more absolute and simpler shadow. The last version has overlapping shadows, it's more noticeable on her right leg you can see a X shape due the multiple shadows.
This project looks promising.