wow thats an awesome stylized tank model. Being that its stylized and all, maybe try bringing that into the texture. What you have now is going in a more realistic approach and is appears to be very conflicting. Try flat colors first, get an idea for what color the shadwos will be and how different color areas will affect each other. You're putting too much effort into one area, get everything painted first and then start detailing areas.
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I think I agree with ironbearxl, but that depends on exactly how it's executed though. I know that's not much help but: meh.
finished,came out ok