It would definitely be a better highlight drybrushed directly on top of VGC Rough Iron or Warplock Bronze, now shade wash necessary.
As it is I'm not sure how it looks. The Hammered copper is very Red and the Retributor Armour is very yellow and then the Runelord Brass is desaturated. I'm going to add a AP Soft Tone wash to try to equalize things a little bit.
I'll then decide if it needs any more metallics on top.
I also need to add some gun metal nbit on the lower legs, it's the only place I use it. I have discovered the original Warglaives legs were possibly just Warplock Bronze on the lower sections, so that silver shin really stands out. It's also quite the difference to see the range of metallics on this Helverin in comparison.
As I have to do the red highlights on the carapace I thought it best to still keep the shoulders separate so I didn;t accidently catch the metal with red.
Guns are also highlighted, but I have to tidy them up in places and noticed some areas where the paint has already scratched off.
I was a little disheartened about how easily the paint was getting scratched off, thanks to the Simoniz matt black spray I primed it with, when clearly it's not a primer. Home Bargains has finally had a delivery of its £1.99 sprays and primers, it's too late now but at least I'll be OK if I need to do anything else. But back with the Helverins I needed to take a few days away from it to destress. However, I think the next update will be significant as I was actually then able to spend some real solid focused time on it to move them on. Sure, these look well on track and even the next update seems almost done but there is so much still left to do - highlights, all the weathering, decals, the battle damage, glow effects and finish off the bases. It's not as foregone as it may appear.