Boy you really need to see this in its large original format to appreciate the clarity of this shot, even with the haze. But it looks like you should have overlapped a little more as it appears there's a couple places that didn't stitch together very good.
I went on holiday to Venice with my wife to celebrate our 10th wedding anniversay (Aug 12). Fortunately ZipperZ came up with the PANO challange, there were plenty of opportunities. I can recommend everybody to go there, it's very romantic. No cars, no busses, no trains, no bicycles, just walking ....