Well, congrats on going all manual and on testing the polarizer! All big steps towards getting to know your camera and your entire hobby better and better.
The light situation I can see in these, however, tells me that there was no good use for a polarizer, at all, other than testing it. But you cannot have got much of its effect with this diffuse light. Did you SEE any of its effect through your viewfinder when you turned it?
I'm asking because I must have tested my very first in unfortunate light situations, too, as I couldn't verify what my sister had told me about using a polarizer at all. She had said: "Just turn it and you will SEE its effect" and I saw NOTHING.
Later, in the right light, with the sun at the perfect 90 degrees, and some nice clouds in the sky, I did see the effect! Wow, I thought...