Thanks all! I tried again and got it straightened and squared, as Karen suggested (new things for me) and it does look better. I need to learn how to use the brush effectively, but I think the whites on the shoulder are just gone.
With Z9 the blinkies are available just when reviewing pics you're taken correct? I did try to use exposure compensation at times that day (there were a lot of white birds, only one tricolor heron) but I haven't learned to pay attention to the histogram in the viewfinder, or review the pictures as I am taking them.