2 things, Nick, besides the vignette, which has already been touched upon.
1. Too many. I try to limit myself with my pictures and I try to choose the best 5 if possible, 10 if needed. Simply put, nobody really cares to look at 20+ pictures around the same location unless they're REALLY good pictures.
2. All underexposed. I got shit from this a while back with underexposure in my black and white shots, so I stopped doing it and realize that I was dumb to do it in the first place. They're all so dark, bring up the highlights and lights, it would make them a bunch better.