OK then, I can verify it's a part of a page from the special Madoka booklet in May 2011, issue 132 of Megumi. They're official character drawings, so the artist would be Ume Aoki.
@shadowstalker. I'm pretty certain it's Ume-tentei's because she did all the original character design concepts. Plus, the father and younger sister never appear in the anime with these designs. The animation crew went with the SHAFT-approach of cool-looking cardboard cut-outs. Here's the full-scan page where it appears if you are curious: http://i54.tinypic.com/2mnelih.jpg
Hm then I'm not sure since the father and younger sister didn't show in the anime with these designs, since these are concept designs. Young Kyouko did briefly in a couple seconds flashback.