I'd lean the green a tad towards a bluer shade myself. As already stated by others, and I have to agree, a slightly bluer green would give you a really nice contrast with the fiery orange and yellow on the flames and lava bases. I don't think people would confuse them with Legion of the Damned however, as I've seen tons of salamander stuff have black panels with flames on them. The trick is to get a bluer shade of green without it looking turquoise, but if you darkened it a tad or even started with a dark, cool green base (I'm thinking like a dark spruce green instead of DA green as a base) you could build it up and still keep the bluer shadows to give more contrast. I'd also like to see some scorch marks on the feet, since they're walking on lava, but you probably already thought of that, since this is just a test piece.
Maybe try making a green with a touch of blue in it glaze? That might give you the same sort of effect, but I love glazes, you might not.
This is the sort of green I was thinking of.
The 2 f's/ in giraffe/ are like 2 giraffes/ running through/ the word giraffe/ The 2 f's/ run through giraffe/ like 2 giraffes. (Ron Padgett)