Awesome composition here! I really love the details on the ninjas; their sword, the musculature underneath their shrouds, each one is a complete character. I also love the skulls in the foreground and how well they blend into the dark reds and browns. Great work!
Wait! They're actually Ninjas! I thought they died out, and replaced by well known, and easily identifiable stereotypes. Joking aside, they're well done. Though they really should be running now, they seem to be in a spot of trouble, and Ninjas aren't known for their battle prowess. Western Media notwithstanding.