Something looks off about the artwork.
If you look at the champion sneakpeek, you can see that zyra's hair is spiky almost, kind of like current asian hairstyles. However in the art spotlight her hair is long, smooth and looks like Jesse from pokemon.
Her attitude also seemed to shift. In the sneakpeek, Zyra seemed like a mysterious champion who no one knows about and keeps her objectives to herself. In the art however, it makes her look like an aggressive (less mysterious) figure.
Her ears are also made of "skin" in the sneakpeek and are made of "plants" in the art spotlight.
Thats not to say she doesn't look like an amazing champion.
EDIT: This was basically what I thought while watching the art spotlight. I am not saying that everyone will think this way, or even agree to what i'm saying.
EDIT: Just created a thread about this: http://na.leagueoflegends.com/board/...2#post26856392