^^^^ Previous images have ghost cats more white-ish, or blue, or teal. I suspect the colouration is just something that naturally varies, perhaps by region or phase of the moon or something since each image has but a single colour of ghost cat.
I continue to be impressed by the use of space in these images. The backgrounds (and foregrounds) are always rich in detail and well filled out. It's never just witches smooching in a vacuum.