Thanks Alfi.
I have a R6. Picture #1 was shot with 28mm in a low angle, and I adjusted the perspective in pp, which I suspect amplified the distortion. I use Gimp for pp, and I don't think it has any tools that can correct such distortion. It unfortunately does make the picture look a bit strange.
About the painting-like rendering, it was not any deliberate action of mine, but anyway, here's what I did to the first two pictures: The light in all of them was very, very warm, so I added a layer where I used auto levels in Gimp, that sets a new blackpoint and whitepoint. This made the pictures too cold, because there was a very warm light when I shot them. So I backed out a little with the opacity on the layer. What I found then was I wanted the warm light on the trees and buildings, but the colder light in the sky. So I added a mask to the cold layer and drew a gradient in it. For pic #1 I cut out the inside of the window, so I "cooled" the sky, and the gradient starts somewhere below the balloon and ends in the upper parts of the buildings, I think. For pic #2 I just drew the gradient somewhere in the lower middle part, so the top is cool, the bottom is warm, and there's a gradient transition in between, a little tilted, aligned with the lines of the houses. Perhaps this artificial increase in temperature range is creating the painting-like feeling?