Hi, and welcome to the board Julio. You'll find the people here rich in knowledge and that they'll always share tips and advice with you, especially when it comes to photography.
I like your first shot the most, the colour is really well defined. The only thing that I would change is to crop out everything above the horizon as it doesn't really serve or offer anything more to the photo.
Cheers, looking forward to more photos!
Attila
