Not to bad,
some good points :
* atleast you got the proportions right
*It isn't one of those crappy ms paint vectors.
*it looks clean.
Some Parts that could be cleaned up a bit:
* if you didnt' use a ref pic, use one, just make the vectored bits on a different layer.
*Make the shading on the legs more curvy, the way you did it makes it look rather boxy. And on the arms, don't put the shadoes on top unless the light is coming from the center of the tori :P If the light is on top, the shadows go on bottom. ;o
Overall, it's VERY good for a first, comparing to a lot of recent ones, nice work