I think I actually used a levels adjustment layer. I don't remember exactly what the settings were. I just brought up the midtones a bunch, and then the highlights a bit. I also used a selective color adjustment layer to boost the colors
The colors and textures are great in these!!! I love the edited version of the third, very awesome!!! The sky in 2 is sweet as well!!! I'm feeling jealous as well
Wish I could be original, but #2 is by far my favorite as well, closely followed by the 3rd. Your photography skills coupled with your command of PS really makes your work shine.