I spent an absolute age hand blending every line and hand blending the OSL glow on the orbs. I think I've achieved a richness and neatness doing it this way that couldn't be achieved if I'd used my airbrush.
If you'd like to see more pictures check out my blog.
My Necron painting tutuorial is here if you'd like to know in detail the techniques that went in to painting the model.
Thanks for taking the time to check this out.