Looks good. One thing you may want to do is give the ribcage and rear torso a bit more volume. I've always had trouble positioning tails as well, but when they're done well, they're yummy. :D Another thing I've found helpful is noticing how the top line denoting the eye's orbit curls down gracefully leading to the nose. The eye is pretty much where I start constructing my faces.
In other news, I like the cute, playful pose.

Agreed with this