What's this picture of a smiling character with blue eyes and light hair from? I wonder where is this image from. Does anyone know its origin?
I am aware this post is old, but people looking for this same image is going to stumble upon this so I might as well just end the frustrating search.

Here you go :)

The picture is from the cover page of Magicians Don’t Turn Back!, a Touhou doujinshi by Saku Saku Tei.

I spent so many hours I don't even want to say how man.