Wow, awesome skin so far! :3
That's a pretty good vector of Neku, but the lines are too round and smooth, in my opinion. The outline needs to be a bit sharper, especially for his hair, and the fingers look a little bit stubby. Then it'd look like the official HQ versions of the art. Though it's already really good!
If you want to know what I mean by sharp lines:
Here's a vector I did a few weeks ago of Minamimoto.Also, warning: HUGE image.
Anyways, can't wait 'till the skin is done! ^___^
EDIT:
What did you use to make the vector? And did you use a sprite to trace the image?
If not, here's a sprite sheet by Ragey, taken from the Spriter's Resource. The pose vectored in the skin is in the upper right, try comparing the two.