I am very impressed by this! I especially like the shadows. It shows how well developed these characters are. I feel sad that this wasn't made into a cartoon. It seems like this would be more serious stuff. It would be great to try your hand on something different.
Of course, you were probably intending on something more comedic. I love the look on X's face. At least I recognize THAT character. I have no clue who this Spark Mandrill is. Whatever it is, it's a great picture!