Oho! I know this anime! I loved the first two episodes I've seen from this series and I hope I'll find soome time to watch the rest...
OK, to the topic - I like your vectoring; the lines are mostly smooth, although you proably still need to work on the edges. They look a bit -I don't know - jagged? On the other hand, the grass and the bamboo in the background are flawless.
Maybe I'd also change the use of smudge/blur. Instead of blurring the shadows on the characters, I'd blur the BG because that's less important than the characters. And you want the characters to stand out, right?
And lastly, I agree with you about the eyeball! It really is cute. :D