One suggestion would be to number your images. This makes it a lot easier for a reviewer to refer to any given image if they wish to provide some C & C.
My general impression is that, except for the star trails, they all look underexposed to various degrees.
I like the star trails one and the last one as well but the horizon in it is not straight, and as WesternGuy said, the rest are underexposed. Pics taken at night sometimes benefit from more contrast, not all-around darkness.