As BoBzz wrote they are supposed to represent githyanki, who generally are given pale light grey flesh. But the undead green also works well on them. The NMM is fastastic.
They seem to be made to represent githyanki from D&D although im not sure what color they are supposed to be...
I think they are supposed(from the art i have seen)more of a pallid/ghostly white flesh.
These are awesome models and I really like what you did, especially the blades.
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