Nice work on the barricades Antarius,
the marker really stands out ! mind sharing the technique?...
And yes, certainly. I kinda made it up as I went along, so this is from memory:
First off, I gave it a black undercoat.
The outer band, skull and trimmings is just leadbelcher with a bit of black washon the skull and rivets. I drybrushed the skull with a lighter metal colour afterwards.
The yellow/orange parts got a coat of mechrite red (mephiston red will probably do as well), then I smeared on some averland sunset while the red was still wet-ish and mixed it up a bit. Then I put on flash gitz yellow (I think it was) and a liberal wash of casandora yellow.
I think it turned out pretty well, even if it was mostly a thing I did while the washes and stuff dried on the terrain (the marker probably ended up taking more time than it ought to have though). If there's a key to my succes, I think it was that I didn't bother with making the yellowy colours very neat - indeed, they look sorta messy up close - as that gives it a slightly more "expressive" look that works well at a distance.
Hope that helps