The only one I somewhat like is the third with the sunset. But to go in CC order:
1- the horizon is not level, the sky is blown out, the sun is very evident, there is too much blurry in the foreground which makes the image feel really in your face. Lack of contrast.
Maybe look at cropping out some sky and some foreground, adding in some contrast or work with Levels / Curves ajustements, and throw it in black and white.
2- Ok...no. I can see going with the abstract lines in there, so good job in trying to see something with a different eye. But the image comes off as flat. You can do straight on pictures of things but you need something that still attracts the eye like a really obvious line or some great texture. Seems under exposed as well.
All just my opinion though.
3- Nice silhouette here. Composition might of been improved by being a bit closer in on the cross and having it a bit more to the left. Love the sun.
4- When shooting animals or children, get down to their level! Standing straight up and shooting straight on are often things that people do with P&S cameras. Explore different angles to shoot things that are lower than you. Get in closer on your subjects as well.
5- Nice exposure on the lions and an interesting composition. I would of preferred being closer in on the action though to really make the lions your main focus of the image and not just a scene that has lions in it. Those faces look too precious and cute to be from far out.