LOL, I've been staring at this for too long, trying to figure out what's wrong. It's all a matter of perspective, isn't it? There are many ways to do attic windows, and it's somehow harder when there's only one window. So you just have to decide what the perspective is and then choose the angles and darks/lights accordingly, right?
I like this implementation of attic windows, because you are looking directly into the center windows.
http://quiltinspiration.blogspot.com...c-windows.html