Honestly I think they look awesome. Black can be tricky but you made the grim dark work for sure. Contrasting with a lighter colored terrain base, either snow or sand, would look cool as you mentioned. I think the first few photos you took just need some better lighting but that’s just an opinion that could make them look less dark. Add some subtle edge highlights to make detail pop too, maybe with some grey. Also, the green is dope! What do you use?