That looks great Paul! Great detail and smoothness.
One thing I've noticed though is that various browsers don't render B&W images properly. See the attached screenshots below. The one on the left is the Astrobin view and the one on the right is after download in PS. The downloaded version looks better presumably because the colour profile is managed properly in PS. I initially thought the view in Astrobin looked black clipped.
I find that changing the the colour profile of a B&W image to RGB allows a consistent rendering of B&W images in browsers.