Unless the old artwork are things you hadn't shown before, I think it would be best to upload new art of old characters, if that was something you wished to do.

I'm mostly referring to pictures done by others that I've never posted to any of my galleries and may or may not still be on FA (although most of them are I think). The thought process behind this was to have all the art of my characters in one place (since FA doesn't have a folder system for favorites right now), and also in case something happens to the hard drive I have them on so I don't lose them.

As far as my artwork I had considered moving that here as well but it feels redundant so I probably won't.