I don't like the top of the zipper, the blur takes away realism. Also the zippers would cast a shadow like your fingers do. Nice idea though, and pretty well done.
What kind of processing did you do to the photo before the zipper went on? You can see where the shades of light gradient change in some parts of the photo. Maybe it's from JPG compression, but it's something I get sometimes when I do some heavy processing to an image.
Thank you all for the comments. I agree with the top part of the zipper, I havent had enough time to sit down and really try to fix it. I just wanted to throw this up here and get some feedback