Unbalance

This is a great piece. It has such a powerful impact on it. You can tell the difference between the two just by looking at the piece. It's like happy and sad, the sun and moon. I give that a full five stars for that.
On the technique. I like it, but I feel like this could be a much better piece if there was more detail to the background, the characters (even though there already is) I like the shading, it looks realistic. I give that 4 1/2 stars.
This is very original, because they are your characters, but I've seen plenty anti-characters for objects, so I can't say it's 100% original. I'm giving that a 3 1/2 stars, I apologize.
The vision. You can tell just by looking at it, it can tell a story, and gives a certain mood to it. It could have been at a better perspective and had more detail, which could have made it more appealing to the eye. I give that 4 stars.
Also, a quick note, make sure you shade everywhere, I noticed on the nut part on the blue side (not the shell) It wasn't shaded. If you had shaded it, it would have been more appealing and make the darker side pop out more.

It's an outstanding piece! Everyone can definitely improve, and this in the soon future might be one of the best pieces in the object community!