Excellent image, is it a stitch or a crop?
Great colour and detail and a very difficult scene to capture, however there is one little niggle for me and that is the darker area in the sky top right (polariser effect?). I am sure you could lighten that a tad and blend it in if you agree.
From experience, I have found that polarisers and pano's are not the best of friends, so for me and for no other reason than to avoid the uneven sky effect, I no longer use a polariser if I am stitching a pano.
Yep, that's the polarizer. I keep doing the same thing over and over again. The other significant mistake is that although I put everything on manual I forgot the change the ISO from auto so all of them are shot at ISO 800. On D90 is not that bad but is not optimal either, probably the largest that I can print without major issues is around 44" length (which is the maximum of my printer anyway).
It's a stitch from 8 to 11 portrait images, forgot how many. This cropped version I think it is somewhere around 400 MB. Initially I couldn't get it as my leveling was even worse than I thought, upgoing from both sides to the middle so I was getting only very circular images.
Eventually I initially processed them in DxO where I took care of the geometry and noise and also leveled them, from there it went into Photoshop which did a very good job on it's own.
As I am terrible with Photoshop because my time is limited I just saved the image and did all the other adjustments (curves, clarity, etc) in Lightroom.
You had a really good day without the usual heavy haze.
It was better than others but not great, however some basic adjustment with clarity, curves and black levels took care of it.