I agree that we should vote for 4* girls and below (I think 3* and below deserve it more to be honest). Many of their animated sprites all share the same torsos/legs/arms and can use a truly unique look to better match their character artwork.
As for my vote, I am voting for 4* Yulan.
Also, does anyone have a link to the JP contest winners? I'm curious as to how they changed their artwork/sprites. Thanks!