TBP: The black legend album cover

This is a work i did in early 2015, a double cover (front+back) for the third Thirteen Bled Promises album "The black legend". 
They requested me to work influenced by Goya's painting "el aquelarre" https://upload.wikimedia.org/wikipedia/commons/e/ec/El_Aquelarre_(1797-1798).jpg but depincting the humans invoking an intraterrestrial leader and surrounded by grey alien phoetus sacrificed, all in the middle of a medieval ufo/human/instraterrestrial war, where humans are allied with intraterrestrials against outsider gray aliens. 
http://www.thirteenbledpromises.com/