I like the idea, and the realism and the looks of ninjas are done very good. I also like your style very much, but you didn't say what you drew it with, so I'm just guessing it's photoshop. I only don't like the background (it's like pinching in the eye a bit?) and the red surrounding. However, the kanji is made right and it's also used in right occasion of the picture. I won't judge more but just take down with rating this: Vision: As I said, it's like a little bit "pinching in the eye", which I only think you should change a background color or image? Originality: Nothing to say, very original idea. Technique: I don't know but it can't be see how you actually drew it. I won't guess. Your thing. Impact: It did leave a good impact to me, but not that I will be out of breath. I think 4 stars are enough.
This are my pure opinions. Don't take them too much to heart.