Armand, #1 is a rather decent landscape photo, having several elements usually necessary for this type: dramatic sky, sun burst, leading lines, clear separation of foreground, middle ground and background, and (relatively) interesting foreground. The post-processing seems decent too. The only thing that I would try (to see if it works) is to slightly vignette (darken) the corners.
#2 has a dramatic sky, but a rather bland foreground… perhaps further cropping it out, into an even more panoramic format might help?
#3 is rather busy.
#4 has a potential, but I do not care much for the chosen colors (too blue, and sky too weak).