Haven't watched it, that's what a google reverse image searched turned up. The art looked similar, could be wrong I guess?
Sorry no idea.. but its not from Kimi ni Todoke... the art its completely different not to mention that those characters are not even in the series... or at least from what i remember and i google it and those 2 dont appear XD
ah, yeah, just went to double check, and that was only the first link. Apparently it's original art from pixiv, no series. Sorry mate.
Its fanart of Sadako from The Ring. Its made by the following artist http://www.pixiv.net/member.php?id=1965816