I know the artist of those portraits, Oldhat! She was my roommate in school! One of my favorite people in the whole world. I'll edit this post with more links to her stuff momentarily.
Her twitter. Her deviantart. Her Tumblr (or one of them. Pretty sure she has a few.) I remember hearing her get sort of bummed that that was going around without credit. The person that put it online got the images from the only website without a watermark, because if it had a watermark it would end up on prints of the images. I love those things though, and I'm glad to see them pop up here.