Hey Arthurm,
Well in my opinion one thing you should start working at is your .css file.
You have to many type of text formating and it is not pleasant for human eye.
Also another observation of mine: although you were trying to get a working design for it, there are some minor changes that could improve your website. I usually get the old fashion way: blank paper and pencil
try to put on paper what is in your head. Then start applying that. When you get new ideas just get that paper and check where you can insert them so you don't ruin the first main picture.
I hope my feedback was helpful. If so you can anytime ask me for help. The least I can do is to offer you some general ideas.
Cheers,
Steven
like Al Boliska said: "All lasting business is built on friendship."