Looks really good Peter! It is quite a dim galaxy so you've captured it nicely.
My only suggestion processing wise is to use a star mask (or a stronger one) on the brighter stars as they have turned into a bit of a donut. This happens when doing an unmasked HDR the bright (potentially clipped) data doesn't scale very well.
The same look can be caused even without doing a HDR if during the Histogram Transformation you clip the top end (the brighter stars) to drag up the bottom and allow a better dynamic range.
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