She looks shocked by this transformation into a saber-tooth. Seems to me like she'll have toon the matter before she finally comes to terms with it.

I feel this kind of transformation is good practice to draw both human and animal features, in this paint/brush style.The two have different head/skull shapes, and I bet that mismatch must've been disorienting at first. The smoothness of the transition is most evident on the mouth, where you seamlessly transition the shape and color of the teeth and the lips.