Ah, the green eyed monster, in a literal sense here. Excellent texture on the skin, gives her a kind of decaying look, added to by the shredded material of her dress, the folding and highlights on which are executed perfectly. I'm not sure I see why this represents envy but the artwork is certainly executed expertly.
I have no idea what a Githyanki is. And as you probably may see in the picture tittle same as in artist description, the picture is a commission. The design and the idea comes from commissioner not me so if you have any question like this one, please send them to the right person, thank you~