I know you didnt ask for it but I am gonna give some advice on doing NMM. It doesnt look bad just not quite like metal. You need darker shading and more highlights. Your approach is right so dont change how you are doing it, just the colors a little. Dont mean to offend you by saying this just trying to help out a little.
Well done! From what I can tell, your colors are crisp and the paint is at just about the right level flow and thinning. My suggestions for improvement are for more highlighting, especially with the NMM. I would advise setting a light source direction and focusing on highlighting it based off the direction the light source is hitting the armor and such, as it seems that you just did general highlighting. Just my two cents, overall, good work!
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