to me the color isn't important, i've seen on CMoN beautiful NMM made with pink.
the highlight on trims and kneepad look good, while the khorne symbol needs a more sharp highlighting to me.
you improve from a pic to another, very good!:D
Mahon: I've tried your advice and I must admit I looks better now. The contrast is good, now I only need to figure out where to put the sharpest highlights exactly
I haven't painted for 2 days now. So I can start working on my NMM again with new energy