@DestroyerHive: Stop that, it's rude and annoying. Even though this is an English-based forum, not everyone who uses it is a native English speaker. I'm not sure if Hador is or not, but what you're doing is impolite and immature. You only offered a little bit of creative criticism, and your grammatical criticism isn't helping him improve his modelling. Also stop that French-speaking in every thread you post in. It's also annoying.
@Hador: These look great for your first models. 3d-modelling has a steep learning curve, and you may find it hard at times. Just hang in there, and look up tutorials frequently. You never know what you'll find useful. The only thing that would help these is a new texture and possibly some railing on the sides of the bridges. I also have 2 questions for you:
1. What 3D modelling application do you use?
2. Could you post a wireframe shot, please?