And for the sake of completeness the one's I've already got:
NicoNico Douga: www.nicovideo.jp/user/16421907
Pixiv: pixiv.me/radiant_cadenza (I almost never draw, so this account is SUPER Dead, but still, I have one)
Feel free to watch/follow/like where appropriate if you like.
Obviously, I hardly ever use or update this account anymore. Almost to the point where I'd delete this account (And purge some of the now slightly embarrassing high school grade work still on here from the back archives) but I'll leave it up just in case and also as a method to contact certain people and such.