One in an occasional series of “Usernames Illustrated”: RedGeekChic.
The official tumblr of IllustratingReddit. You might also be interested in the artists' Etsy shop or her website.
If you're a Pinterest fan, check out the IllustratingReddit boards. If twitter is your thing, you can also follow IllustratingReddit there. Everyone is on Facebook, so there's now an IllustratingReddit fan page there as well.