I'm no expert so I can't really give any advice on the finish with your airbrushing. Have you done any edge highlighting on the model or do you go for the smooth blending style? Just got back into the hobby myself and have been hand brushing. Funny thing is I saw the white armour on the box and loved how the Vior'la sept markings stood out and set to repaint what I had. Except progress is becoming glacial with my novice level skills and white armour.
If youre interested here's how one of my first attempts turned out:
It's rather scratchy looking but I'm quite please with it.