The Queen Commission - finished?

It is always difficult for me to work out when a painting is finished.  Having made corrections to the shade of purple of her clothes, I decided that the feathers in the hat would look better red, after all.  I re-painted the face, adding highlights and shadows, added detail to the brooch and painted a small Boeing 747-400 on the pearl earring (a reference to the Commissioner's previous career as a pilot).  Sometimes the paint dries a slightly different tone, so I might still change it slightly, but, for the moment, I think it is done.