Its funny how you see huge zippers in art, because it's part of a tagging style, but a few years ago I was wondering around in a store somewhere and low and behold I saw a backpack and I think a sweatshirt or something each wielding the biggest zippers I've ever seen.
As for the art, wow, I always love how clean your stuff looks, it helps when someone who really knows how to draw well does pixel art, takes a lot of extra pixel work out of the project. good job.