Anerytherism (sp?) is a simple recessive gene trait that reduces or eliminates reds in the coloration of the snake. I am not very well versed with brooks king morphs and what they look like, but yours does look anery. It gives the snake a ghostly look and the yellow coloration doesnt really develop. They stay some shade of grey to offwhite to even blueish in coloration especially in the light spotted areas.