do you really want a tornado on your arm? maybe there could be a little more abstraction to it. if i saw someone with a tornado on their arm, i'd put them in the same category of someone who got the tazmanian devil or yoda. its nice that you are having a conceptual value, and not just aesthetic purposes, but a tornado? maybe you could have a japanese style wave and water on one side (like what they use to surround the coy fish sometimes or you can see them on japanese paintings) and a butterfly on the other.. i'm not seein the tornado.
<img src="http://oceanworld.tamu.edu/students/waves/images/hokusai_wave_1.jpg">