Heh. On the bright side, you know I must really, really think this is a good drawing, since I requested it to be in one of my groups (Famous Faces), and then when I saw it again months later (the other day) by another artist (the one who took it from you), I requested it again.
I left another reply for that guy on his page, the one who took your drawing. He's now saying his version is a digital copy based off your pencil drawing, but his version is 100% identical, only a bit blurry due to having been enlarged than your copy on this page.
His also has what appears to be small wrinkles or folds (maybe hair you drew?, but they look kind of like wrinkles in the paper - which isn't bad, I'm not knocking your drawing for that) in the same exact places in his version that are in yours.
I've done digital drawings and paintings by using reference photos, and there's really not many artists I've seen who can copy another image 100% by hand in that way, to the point they get even minute details to match up from the source image, such as stray hairs, etc.
We had an exchange of messages. I have no problem to grant permission to use my original, if the source is mentioned. He preferred to remove the digital 'drawing'. I ask to myself the same questions you did, but I don't have an answer. Thanks for the support anyway