thanks all for the comments and advice, as always appreciated.
i have taken Johns advice and cropped the right of the original. it works better.
The possible dust spots are . . . the dark spots above the structure on the right
were 2 birds now cloned out, the bright spot above that is Jupiter now cloned.
I brightened the snow also, slightly.
The halo is mostly due to the compression although there is a very slight amount visiblte in the original.
I have posted a higher res image which reduces the effect i think. tbh its very minute.