I'd try decreasing the brightness on the highlighted edges, too. The thickness of the bevel makes it look more like a lump of cardboard.
I tried that, but it doesn't look as good in thumbnails. Or in the full version for that matter.
Also, I'd do something about the drop-shadow. A piece of paper lying flat on a desk doesn't cast a shadow like that.
Also tried that. Reduced the shadows on that, and tried reducing the shadow on the notebook as well. Looked bland.
Also, if you think about it, a paper can cast a longer shadow if the light source is off to the side. I'm not sure why it looks like it's floating. Maybe because of how the drop shadow is just a copy of the layer's mask, and a real shadow would be connected to the paper at the top right and lower left corners. But really don't want to have to draw all my shadows manually. Makes it a lot harder to adjust them.
Oh, and add a coffee cup stain!
Hm... maybe I'll try doing that to the desk. I have some stains handy that I made for a texture CD a long time ago. As for the paper, the whole things gonna be covered in letters and so I think you wouldn't be able to see it there really, and if it was dark enough that you could, it would probably affect the readability. But on the desk is a possibility.