I am a big fan of Tamiyo, and seeing this totally makes my day! She can't be serious all of the time. I like the contrast between your art and the one chosen for the card. The emotions portrayed are quite different, which I found enjoyable. (Silly instead of serious.) Your stylized, very colorful style helps to emphasize her silly side while creating further contrast between the images. (The Tamiyo in the card art was dull in color, but realistic.) Very well done!
She might look a bit silly on this, but her Planeswalker effects are nothing to sneeze at, what with her emblem, comboed with Time Mastery (also from Avacyn Restored), could turn into an infinite loop...
The moonfolk, or soratami, of the plane of Kamigawa are a secretive and inquisitive race. Their knowledge of the metaphysical forces on their own plane is unparalleled. When the field scholar Tamiyo became a Planeswalker, gaining the keys to the Multiverse was greater than any dream she ever had. Each plane seemed to her to be an unexplored trove of knowledge to be brought back to the great scroll-towers of Oboro.
For Tamiyo, every plane holds a mystery that sets it apart from all others, and on Innistrad that mystery is the silver moon. Tamiyo has been observing Innistrad for many cycles, using her powers as a Planeswalker to gain insight into the force it exerts on the world. She has watched with rapt attention the moon's effect on the lycanthropic curse, and she has written extensive notes on the ebb and flow of vampire frenzies in relation to the moon's influence. Her curiosity eventually led her to the door of the famed Nephalian astronomancer Jenrik. Tamiyo spent months in his moonstone tower poring over countless charts, adding her own observations to his collection about the odd power the moon holds over the denizens and populace of this plane.
With Avacyn's return, Tamiyo has been excitedly writing theories about the angel's effects on the land, its creatures, and the moon. The nature of the Helvault, the creation of the wolfir, the appearance of the gryffs, and the origins of the newly empowered holy wards are all filling her scrolls with more questions than answers.
So yeah. I love her already. Amazing fast artwork, love it <3