Hi Richard, I think with the RAW file and a lot of patience you could do more than you have so far.(certainly with photoshop)
Below is a a quick (well I planed to be quick) effort that could do with a bit of localized sharpening which I have not done.
If it were mine I would work a bit more on the background even to the extent of cloning from another photo if I had one available.
P.S. On looking back at the original I see I have mistakenly cloned out some darker feathers that should be there. Sorry it is not a mistake I would have made if I had taken the photograph or had been in less of a hurry.