Most recent, and my favorite, is a picture of Tibarn the Hawk King from FE: Radiant Dawn (well, he's also in Path of Radiance, I guess.):
And this seems to be viewer's favorite. Lyn from FE: Blazing Sword (the first American release on the GBA).
And a homage to FE: Mystery of the Emblem, a really old installment on the SNES.
More from the FE100 series here. :o
[x-posted on my journal]