They May be bad, but they're the only free ones you'll find.
About this creation
They're very bad... I suggest you not use the torso decal, because I did the same thing. Note that these were done in illustrator which is very, very hard and frustrating. If I had MS paint, they Might be better. Try drawing your own torso with pen. These are the only free Ninja Decals you're gonna find and if you actually do choose to use them don't forget to give me CREDIT, CREDIT, CREDIT!
Here's a picture of my Ninja (Right of the picture). I suggest making your own Torso on MS paint... if you have a Mac like me, draw one very sharply. Do the muscles with a pen and same for the outlines. Then, using the utensil of your choice, I suggest colored pencils, color in the blank spaces. (Red and Blue; Orange and blue)