`Yep, I know Chibis Are really popular for its Simple and Cute Drawing. If i examine correctly, I think the 'Tweek Tweak' Got hot because of its Chocolate or Tea he's holding. I Know Chibis Are really Cute, But i Suggest You should give more details to it.
Maybe You Should Change the clothing, Because simple clothing Didn't Make it TOO Cute. So i Suggest The Chibi is wearing an Everyday Clothes like T-Shirt Combined With a Shirt or a Jacket With a jacket. (but avoid using this suggestion to a girl, Or the Girl became a tomboy.) But keep up the good work! I like it, you know!