No polarizer=Weak sky and cloud colors.
Make it a circular polarizer. It will align the light rays to darken skies, brighten clouds, remove reflections and hold hard-edge colors wherever there is an enormous amount of light bouncing around. Order the filter for the millimeter size of the lens on which you will be using it. If you don’t know the size, look on the back of the lens cap. The number is almost always there.
Polarizing filter to the rescue.