Just check my gallery, I used to describe my recipes.
For steel I use nowadays VMC German Grey, London Grey, Medium Sea Grey and Pale Grey Blue, but any bluish grey scale would be fine (in the past I used VGC colors, like Heavy Charcoal, Sombre Grey, Glacier Blue)
VMC German Grey is the darkest color and I use it in the recesses, and build the colors up from German Grey:London Grey to Pale Grey Blue, and use White as highlight color.
On the biggest, forward looking surfaces I paint the light colors towards the bottom, and on the side looking surfaces I paint the light colors towards the top. The other surfaces need some figuring to look right, but the basic idea is to preserve the contrast, not putting similar colors to each other.
For shading I use the loaded brush method (German Grey:London Grey, then some Medium Sea Grey and a small dot of Pale Grey Blue in the tip of the brush), sometimes I paint from the middle to the edges (loading Medium Sea Grey in the brush, and some German Grey/Pale Grey Blue in the tip of the brush). When I am lucky, it takes me 3-5 passes to paint a surface, but sometimes I need 10. As you can see, I am still working on it.
BTW I did not mention, but broke one of the spears, too. :angry: