I watched some videos and I may have worked out how I was going wrong with my airbrush previously.
So I tried again with low.pressure and trying harder to get a decent consistency to my paint.
I went from this
To this
To this
The effect looks maybe a bit subtle to.me. Did I put the green on too thick, or is this about the best you can expect from the technique without using inks or transparent media?
However I think i did ok with the grey up to white. Not award winning, but ok, or am I just deluding myself