Spiral Notebook Binding concept

[DaRadniz29]

So, a few weeks ago I created this for my screenplays, etc. Designed after the Adobe PDF thumbnail. I recently just came back to it and looking to see if I can improve on it. To me it seems too close to Adobe's, and trying to make it more my own, but not exactly how to do that.

Anyway, the left binding is the one I created. The one on the right is the one used in Adobe (Reader?) PDF file icons.

Below is what it looks like with paper attached. Still trying to figure out the best way to make the paper look more full/3D-ish.

C&C is appreciated. Kind of stuck. Guess it will work for now, but looking to improve it.

Edit: Just an fyi: I'm Using Gimp 2.8 for mac.