There very definitely IS a difference between the art in the
TV series and the art in the OVA!! Anyone who says otherwise
can't have watched both. ^_^  I am a big fan of Kakinouchi's
artwork as well and of the two, the OAV is closest to her
paintings.

I buy cels from the TV series mostly - simply because I like
the characters and anything worth owning from the OAV is
either already sold or well and beyond what I'm willing to
pay for a cel. (Even if it IS a Miyu cel. ^_^)  Besides,
where seeing Kakinouchi's work is concerned, I would much
rather see an artbook of the real thing instead of even a
very close replica, like the Miyu OVA. ^_^

But then. . . Have I really made a choice? Nope. . . I have
all three. ^_-

Many Sharp Smiles,
--Drac