The pictures are a bit blurry, but from what I can tell this looks pretty darn good ^_^ You even got the shape of Zim's head right (not an easy thing to do!), and I think it's really neat how you included his mechanical leg thingies. Sculpting Zim is hard (I know, I've done sculptures of a few of the IZ characters meself) so I must commend this sculpture as being probably the best one I've seen. Very nice job! ^-^