Mythbook - Mistress of the Copper mountain

Illustration for Mythbook 3 project.
Mistress is character from Ural folklore, she is sly and secretive, she keeps treasures of mountains and sometimes appears as little green lizard. Mistress was described in fairy-tales, written by Pavel Bazhov, there she gifted Malachite Casket to mountain worker.
I based her look on impressions of real place - Karabash town (here's my photos of that place), where copper factory works and acid rains and toxic blowouts turned landscape into apocalyptic scene. (google it, it's really imposing!) This is not something like "oh that's terrible, we must stop it!" but it's just allegory about the price we pay for some treasures. Just to think again.