She looks like she's smiling. Usually you want to make the model in a default pose, then rig it to convey expressions. Her head proportions are also a bit off. The eyes should be half-way down the head. You need to raise the top of the head a bit.

I would also think about splitting up the geometry. It will be much faster, so have the bones as other pieces of geometry. It will be a MUCH more enjoyable process.