While I'm a big fan of the theme of the piece too, let's be honest, the likeness is like 25% at best.
SMG is an absolutely stunning young woman. While the essence of the slayer character can certainly be pointed out, the figure still doesn't quite capture the essence of the actress, though admitedly some subtle similarities can be seen if we look hard enough or really want to see them -- however, shouldn't the likeness be more plainly evident and generally easier to see? Sadly, IMHO, the only tangible things the statue and SMG ultimately have in common are skin and hair color, approximate age, and relative body shape.
All this to say that it's clearly an immence challenge to produce a piece based on likeness.
While you could never hope for a 100% likeness, you can always hope for something closer to the genuine article.