There are some random grey pixels here and there which look out of place, not noticable, but it makes me doubt wether its a color reduction or authentic dithering. Plus the gradient-looking shading, and the highlights which coincidentially look alot like some white lines set in overlay @ photoshop.
Awesome :D The first thing I thought of when I saw it was the Tau race in Warhammer 40K, if you know them... Fantastic use of colors & great dithering. gj!
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