Nice vector!
Just two suggestions:
I wished you vectored the grass instead of using the brush, because it makes him look like a giant >_< The grass in comparison to him look like fibres ^_^'
The clouds also should be more curvey - there are a few sharp bits in them, but more importantly, I think the next step is to take lighting into account. Determine your light source - from Ichigo's head, I can see the lighting is from the top. So I think the clouds should be lightest at the top (no outline), which the blue outlines/ shadows on the underside - hope that makes sense ^_^'
Nice work :D