What's this picture of a smiling character with blue eyes and light hair from?

Question

I wonder where is this image from. Does anyone know its origin?

Answer 1

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.

Answer 2

It's extremely difficult to determine its origin/source. The best I could find is this image, which can be traced back to at least as early as April 10, 2009:

She sure does look like Marisa Kirisame from the Touhou Project, even though her eye color in canon is either red (in the PC-95 era) or the more popular yellow. I include two images of Marisa for comparison:

^{Original artwork of Marisa by Mokku (cropped).}

^{Blue-eyed Marisa in Labyrinth of Touhou 2, drawn by Juugoichie.}