Thanks for your posts, I mean drybrushing, the airbrush would let me without as much "control" as I wanted in the contrasting litle spaces between the 3 bassic tones of grey: Tamiya AS4 "violet grey (base color), Vallejo 72050 "Gris Frio" , and the lighter Vallejo 47 "Gris Lobo".
Just now I'm painting a Storm Lord with thw same cammo. I'm on the base color coating, so I can post a tutorial from this point, wait for it.