I love how the whole crew appears to be mischievous and are right up on Mark.
I do like how you did the glowing eyes on the vast majority of them, and I absolutely love the look on Mark's face.
Quite honestly, I couldn't find anything truly wrong with this piece. Everything seemed to flow together and the only other thing that I can say is that this is an absolutely amazing piece of artwork. You did a truly amazing job. Keep it up!
Just a slight side note; I really love all of your art. It is really amazing.