Imho
First of all, your picture was awesome. Even paint can produce some handsome results if the artist is dedicated enough. I really like the color, and the highlights are all in the right places. Good job.
But I do have a question. I realize it's probably irrelevant, and it probably has as much bearing as a peanut, but I'm going to ask it anyway. Why did you choose to portray the vaporeon as mammals? Only mammals have mammary glands, and by putting them on the female there, you're letting the viewer know that she'll be nursing the babies when they're born. That would be fine, except for the fact that all mammals (with two exceptions) are live born. Pokemon, on the other hand, are born from eggs. :)
Anyway, like I said, it's really rather irrelevant. There's such a thing as creative license, of course, and you're certainly no exception. I was just wondering if you'd also thought about the same thing I did, I guess, lol.
Btw, the two exceptions are the Platypus and the Echidna. :D