It is incredibly tough to rank the artwork here. All of it is so fantastic. I want to abstain from voting, but that's a coward's way out. Here I go...
1. Cartoons
Best overall combination of style, color and precision.
2. Wyverii
The most impressive artistic achievement. The only reason these weren't #1, was the color. All three pictures look like they are "hazy", presumably because the color saturation is lower than the other artists' works. It's quite a minor detail, but was the deciding factor for me in such a close competition.
3. Kopie
I really debated between Cyzir and Kopie. Both artists have wonderfully stylized versions of the pokemon. Ultimately, I went with Kopie because of the clean digital rendering. For a website, I think digital art is preferable.
Quite a bit of the art submitted will end up on the website, so there will be lots of "winners"....