Hi, many thanks to everybody for comments and constructive critiques.
@Francois: I woke up very early to take the cypresses picture. The sun was rising on the left of the photo. I thought to take a b/w shot to communicate the absolute silence and calmness that I was enjoying.
I used a Canon EF 24mm lens. As you guessed, the cypresses are just out of San Quirico.
In pic #2 I waited for a few minutes before the sunset, it was a lucky shot because I saw this place by chance while I was driving my car :-). Val D'Orcia is a very magic place.
The #4 is the pier of Baratti, a very evocative place. The pier is very old but still working.
@Glenn: thanks a lot, I agree with you, #4 is one of my favorite as well for the same reasons.
@Popnfresh: if you decide to come to visit Tuscany (sooner or later) don't forget to contact me before.
In addition to suggest nice spots for your pictures, I know many excellent restaurants where eating good food and drinking special Tuscan red wine:-)
@Jeremy: I understand your point of view, here the colours in autumn are very intense and the photo could appear over saturated. I'm pleased you enjoyed the others pics.
@RSL: about #4, it's true what you say but in Italy it's not very easy to see piers like that and that thick fog is not an usual sight on open sea, so I liked the overall effect. Anyway you're right: it's not the most original picture ever.
@Slobodan: thanks a lot, as soon as possible i'll post other photos.