I am no expert Martin but I know what I like and I think you have produced a wonderful image...and from Sydney and with "only" a six inch Newtonian reflector telescope... Really that should be in bold .. just think how many more folk would get started in astrophotos if they bought a Newtonian 6 inch rather than wasting time saving for a 80mm...mind you I have used one in the early days so I know just how good they perform.
Again well done..I would like to see what you could do from the South Coast Dome with the Eight inch..just how significant would the difference turn out to be...
Me getting better and spent three days setting up..which is equivalent to your 30 minutes
Alex