I didn't see Sonic there at first, then I was all: "Gasp! Sonic! "
All in all, it's simple, but effective, and you didn't do too bad on making Chaos look watery. That being said, Chaos' eye could use some work, it doesn't look all that interested in the hedgehog racing straight towards it. A little emotion would greatly help.
Still, a lovely piece. Keep at it!
And Waaurufu has a good point