The Sneaky Ninjas

When I read the weekly theme of Illustration Friday, Sneaky, it immediately came to my mind the fast and cunning ninjas, who populated myths and leggends from the ancient Japan...



It was the first time I tried to develop in a rush time an idea like this;
I had in mind a "zen" scene: very quite and tide, in which our sneaky charachters are acting, running on the roof of a pagoda or hidden in a bushel during the night, while a lovely japanese girl is enjoying the apparently calm evening...perhaps the ninjas are going to kidnap her? Could it be the incipit for a story?

Edit: I added much more moonlight to the scene, according to some suggestions!