i did up Nitro a while ago. I found the figure to be really, good, Probably my favourite from The Last Knight toy line.
Nitro has so much detail that i count help but start adding a little bit of paint or pen here and there. I always struggle with 'is it enough, or do i add more?'

I had quite a bit with this guy as he seemed to come alive the more I did.
I used lashing of silver paint pen, Silver Tamiya Paint, and Molotov Liquid Chrome Pen. This was the first figure i've used Liquid chrome on.

I layered over some of the silver with Bronze Sharpie and added some Gundam Marker, and of course that eye needed to be changed to red.

Tamiya Metallic grey on the