Ok, if you really do want constructive criticsm, the main thing that stands out is that you seriously need to work on your typography. Some of the posters are ok in that they are the trendy sort of thing that's in now, but I think the typography really lets them down. Sorry. Hopefully you'll see this as useful, because if you can crack the typography, that would make a big difference. I would also say that none of them have a particularly strong idea behind them - it's just the information put on a page.
Blue Velvet's right - you seriously need to be able to take criticism in this industry. I know how it feels – you put everything you have into design, and it does knock you down when someone doesn't like it because you've put so much into it, but if you can take criticism and learn from it, it's very good. What's the point of only listening to the good stuff? It's just ego fluffing, and makes you feel good for a couple of minutes. Bite the bullet and speak to the people that you think are going to give you the worst rap, and then learn from what they say.