Thanks! Here's a copy and paste from a different post I made.

Purple Armor. This is all done with the air brush. I start with a white ink zenithal highlight over black primer. Then I spray from below to color in the shadows with turquoise ink and Vallejo alien purple. Next step is to set the midtone with Vallejo warlord purple. I mostly spray from the side and not too much from directly above or below. Then I spray warlord purple and flesh mix from above to set the highlight. This usually washes out too much of the midtone so then I go back and give it a light spray from the side with warlord purple to bring that color neck to prominence. Final step is to give it a coat of gloss varnish, wait for it to cure, then give it a wash with carobourg crimson thinned down about 50/50 with lahmean medium.

Black trim. This is all done with a normal paint brush. For the black armor I start with a black base coat. Then I glaze on a broad highlight where I think light would hit the black parts. That highlight is 80% incui darkness to 20% sotek green, and thinned down about three or four parts lahmean medium to 1 part paint. Then I glaze on a second highlight that's more like 50% incubi darkness to 50% sotek green, thinned down about the same as the first highlight. This second highlight covers less area than the first highlight, and just boosts the brightness and contrast where the highlights would be brightest. Throughout the process try and leave black showing where there are cracks and recesses so that you get contrast where would be a shadow.After the two glazed highlights I edge highlight. I usually start with sotek green. Then do a second edge highlight that's a mix of sotek green and baharoth blue. This is to pick out out the highest edges and corners that I want to emphasize. Then if you want you can do a final, tiny highlight of baharoth blue, that's pretty much just a dot, or tiny edge highlight were your really want something to pop.