[righton] Great work! Another thing you could try if jagged spots still show up here and there is just touch the spot lightly with the blur tool to take care of those individual places without affecting the entire image -- likewise you can hit spots with the sharpen tool if something gets too blurred. Make a copy of the pic on another layer to experiment with.
For darkening an area try the burn tool set for a subtle amount and use an airbrush (I like the #300 set to a small size for the exact area).