The shoulder in the old one is a focal point for me, because it bounces more. Her front facing shoulder travels between her torso and the viewer's perspective, and that implies more of a 3D character. The new one, the shoulders are side to side, so a slight field of depth on her body is lost in the animation.
I'm a big fan of the poppy bounciness of the original and I remember it well. Her eyes and smile are cute, her hair dominates the frame, and its a gif that would go well to a music video. Future funk comes to mind.
There's more of a balance between frames in the new one, so a lot of that rythmic pop is lost in favor for a smooth ease. They're both loops, but the new one could honestly benefit from more frames- distinguishing her two actions, from mouth open/eyes open expression to grinned/eye closed smile.
Regardless, your skills as a character designer and animator have definitely improved over the years. I'm fond of her original gif as well, but this new one is perfect for what it is. A landmark- you are HERE at this point in time. You can look back on this years later and recall exactly where you were in life when you made this. And if everything's groovy, you might even be willing to make a v3 by that time.
Big fan of your work, always pleasing to see more stuff from you. Have happy holidays!
