This is pretty cute, and thanks to the sketches below the colored one, (Didn't know it was possible to color like that using markers!) it helped give me some ideas on how to draw Vaporeon better, especially the mouth. ^_^
And I find the fins cute personally, although I never thought about why they had to be on its head; not too many fish do that either. Wait a minute, I can't even think of a fish with fins on its head! xD (I'm pretty sure I can be proven wrong, given how different species there are out at sea, but still.)
eh, you could always draw it with frills on the body anyway. Pokemon can be individuals after all, they don't have to be carbon copy of what they're supposed to look like And if other people don't like it they can shove off.