I think your pictures are of superb technical qualities. Yet IMHO they suffer from not fully developed concept of them.
#1 Is I think too narrow to show the might of that place. Not enough sky, too much sand (for me), plus this tires tracks right in the front. It spoils the serenity.
# 2,3,4 seems like mere snapshots I am taking on the beach, when I am completely bored. And then erase them.

#5 again not fully "cooked". Water probably didn't came out the way you hoped for, lights of the city, I guess due to long exposure are a bit fuzzy and the glare of city lights make the sky grayish, unimpressive. You need help from our members, who do long exposures of this kind.
And regarding idea, I don't know, you wanted to make more of a documentary shot or pretty picture to adore the wall...