Nikon d750: am I seeing things?

Rennee sent me the original file and the pic below is a RAW conversion to highlight any 'funny stuff' that's otherwise barely visible.

 

[ATTACH=full]1202075[/ATTACH] It is not meant to be a example of how to make a nice conversion....;)

 

Apparently there was no lens hood, so the slight radialness of the 'rays', and the sun star (?)... maybe weird flare? There is some tone-banding, but that's only because the sky contrast has been overly emphasized and then JPEGGed.

 

There's a couple of dust bunnies, but again, the excessive contrast has made them look HUGE!

 

There's also some natural darkening of the left-hand sky that seems entirely normal.

If it seems all I need really is a sensor cleaning then I am good with it! Thank you all and Mike for your time!