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1.
It will be your shadows
2.
Thy not to cover too much, only about 60% over the base shadow
3.
Same here, cover only about 70% of previous layer
4.
It will be a base for yellow
5.
Cover over white
6.
Paint little scratches along the brightest places on the armor or trim to mate a scratched effect
7.
Paint even smaller scratches with ice yellow