I'm not sure of the actual motion of the character, but, if she were to just stand still and do the pose, I actually find the old sketch more properly balanced, however if your intention was to have her kinda in motion (hoping/running) then the new sketch is more reliable.

I did a red line just to suggest a find stylistic choice, I'm guessing you are trying to achieve Chibi, something cute.

I would recommend exaggerating the proportions a bit, like make the torso super small and narrow, and the hips larger. Also, for the red line I did, (A) is more in motion and (B) is kinda if the figure is standing still with one leg up.

Gonna wait for the final draft C: and cool cat painting!