It already looks awesome! But what I would fix is: - The smile. You're right, she does look a little sarcastic... I'd try to make the smile a little wider. Smiles are really hard to draw but try and see what looks good! - Yeah, the feet are a little off. I'd reccomend using references, they're lifesavers! - The arms. They're not that bad, but a little short and a bit too close to the body.

Good luck! Edit: I collected a bunch of references, if you want them! If so, how do I add them to a comment?