A day before departing you look and you see your spacecraft in spacedock and, peering through a telescope, your two-year-old spacecraft in orbit around your destination. You’ve been watching it for a year already.
From your viewpoint prior to launch, there’s two of you, and the distant one is old.
EDIT: I’m wrong, and stand corrected. Relativity is so very slippery!
However, when you arrive at your destination, you can look back at Earth and see an image of yourself 1 year prior to your departure.
Also, in regard to your edit: this doesn’t really have anything to do with relativity. Newton would’ve come to the same conclusion.
As for the two images, it’s well covered on PBS Spacetime’s overview of the Alcubierre Drive from several years back that if a bystander were to observe a FTL craft traverse their field of view laterally, they’d indeed see two images, each heading in opposite directions, as you indeed allude to.