I think the animation for this little guy is executed well for my own standards.
Not sure if the gesture he's making is necessarily the most appropriate, but nonetheless it's pretty lively.
The biggest thing I would bring up is the coloring. The colors used here are extremely saturated and can cause eye-burn. This color of green is very artificial and doesn't appear in nature. There is most likely a much more natural color of green that's easier on the eyes and is perfectly good for this little guy. If you're picking a saturation for your colors, the easiest colors to use are likely to be somewhere between full gray and fully saturated.
However, practice will help you develop a better sense of coloring over time.