It is just that these signs do not mean the same in all parts of the world. You should not do the "OK" hand sign in some European countries or South America unless you want big trouble (it is an offensive gesture). Apart from that I like the illustration.
Wish you wouldn't have put The Shocker on there, that's a whole 'nuther breed of rude and obnoxious shirtery. Everything else is really sweet, love seeing a ton of different informal sign language gestures we all know and use.
About my design