Thanks for the edit, Anarkhya! I thought I was pushing contrast and saturation before, but you really showed me how flat it was. And I never would've thought of green for the shadows, but it works perfectly. Plus it gives me a nice shade for AA!
This is what I came up with based on your edit:

and this is where I'm at after reading over the latest comments:

I feel like something gets lost between the two, but that's probably just because I'm struggling to get any definition with just the darkest shades in there.
@Yngar I'm going for a gold-ish metal.