Aye Leo,
My apologies, can't make a substantial difference to the areas you mention, because of the scan quality. Is there any chance of scanning the photo at say 300dpi or 600dpi (dots per inch) on your scanner settings and selecting for a colour photo rather than a black and white photo? Might be able to do something then.

A really good photo nonetheless and the painted backdrop would appear to be of Edinburgh Castle, in the photographers studio. Would the soldier have been stationed at Edinburgh Castle?
Also appears to be a revolver holster on the left-hand side of the uniform belt. Officer?
Hope this may help.
My regards, Bill.