the AA colors are backwards in a couple spots. make sure the darker AA color is always closer to the darker color youre AAing into. You could probably make the lightest AA colors slightly lighter too.
Also, where the white curved line connects with where the line is straight, it looks a little jagged there. I think the upper right hand corner of the paper looks a little rounded, where it should be a sharp corner.
And this is just my opinion on the design, but the way you increased the size of the blue block in the background makes the paper seem really tiny. I think the size it was before was fine, and if youre going to increase the size of it the paper should scale with it accordingly.