Oh boy it's close.
The back of micho's head is so pretty while the eyes are average. Very average.
Meanwhile, mramas is cleaner but the mouth is very unnerving, which is probably a personal preference more than a design one. To me, it goes down a few pixels too many.
I can't see the back of your head mrama, and taking a pic of the entire Tori just for the head is excessive and also not as revealing as a good spinny.
That tipped me over to micho :>
EDIT: forgot to say, art battles are always fun :] Especially the more extended ones. Like: Ok you won the head battle, butthe war isn't over! I SUMMON TRAILS! *Poof* Go PikachuTrail Go!!!!