As an avid practioner of HLD and STF style sprites, I would recommend cutting down the colors, or making them more distinguished. The colors on the sleeves blend with the rest of the shirt, making it look undifferentiated. Same with the shades on the pants, face, and hair. Either make them the same, as they don't necessarily need to be different, or make the colors pop more. Try adding saturation to the shades. Just in general, it would make it pop a bit more. The games you mentioned have very striking colors, and this, while readable as a Mad Max-esque human character, could do with a bit more color.