I experimented with upping the contrast, but ended up deciding, against my early training, that Joe's own version is best, it has a certain soft atmosphere, some je ne sais quoi.
(Click for big pic.)
In the old days in the photo club, many of them were much into Ansel Adams' Zone System, and it was sacrilege to make a photo which did not go nicely all the way from pure white to pure black (or had any white or black areas without detail).
As Mike Johnston has pointed out though, Adams made the Zone System for teaching purposes, not as directions for art. Important point there.