I do these every now and then in my sketchbook to help loosen up my mind. I start with one image ( in this case the guy with his fingers to his mouth ) and then I use the contour of that image to create a new one. It's pretty fun to see what your mind can come up with. After I was done I felt like there could be some type of story to this and, I decided to put the focus on the white ninja.
The main story I thought of was that the white ninja has to destroy the creature in the tank before it gets out of hibernation. And there's lots of weird a crazy characters he has to face before he gets there.