Very cute!
Left leg looks thinner than the right one, since you don't do anything with the space that's between them.
Shadows are somewhat lazily placed
, mostly in the sweater-- they show the volume and folds of the sweater, but don't make much sense in the context of the lighting.
Right hand doesn't seem like its making enough of a contact with the left elbow to serve as support (unless s/he is just placing her/his hand in his/her stomach)
The inner arm joint (opposite the elbow) is not defined, giving it a vibe similar to Adventure Time Extremities(tm) (which I'm not much of a fan of
).
I would make a line there... in the shape of an inverted U, more or less. Hopefully you know what I mean.