First up, congratulations on a well deserved APOD.
Not surprising, as your scope/mount/camera are all superbly matched and are in the hands of a skilled artisan.
Simple questions wannabe astro-imagers, plus those who should know better, (self included ) should ask themselves:
In focus?
Any instrument coma/astigmatism/curvature?
Stars round or elongated?
Any multi-coloured halos?
Any processing artifacts? (eg: real stars don't have dark rings around them..but clumsily sharpened ones do)
Any colour bias?
Any gradients?
Any highlight detail?
Any shadow detail?
Any noise?
Is the subject interesting?
Does the framing suit the subject?
You have asked and addressed all of the above, and then some.
Wonderful stuff