First of all,
This is ABSOLUTE.
There is very little TINY things that cancel that a little bit.
Luke (prof. Layton.) Looks older then he should be.
I don't know if this is what you wanted to achieve, but Mario looks very fat. He is in the games quite fat, but he's just a little bit too fat in this.
This is a very amazing, breathtaking picture.
Your effort put into this is GOLDEN. Keep in mind. But even the best looking things have TINY mistakes. I hope you don't think my critique is unfair, as I REALLY couldn't make a picture better.