Hi Francesco,
You got some nice sites. Only issue I see is that your pics are huge, the ones I looked at were around 100kB. You might run into template issues at some LL's too.
The next thing I would do is to maximize your ads. You only have 1-2 on each page, you can have 3.
I think some of your ads are pretty bland and could be changed a bit. One thing that helped me when I ran out of juice, was to read:
The Copywriter's Handbook after that I realized the big picture behind why my ads that worked, worked and what I should stay away from. It also gave me some insight into what more I can do. It's good when you get stuck on the same path
Good luck