Thanks everyone, I think I'll try figure out this star bloat thing and see if I can get some improvement. I agree with the saturation too, probably a bit on the saturated side, also I see the clipping too (due to being a bit heavy handed on the curves). I have another version processed first that is completely different and more "hubble" like with even more detail in the dust lanes but I lost control of the fainter trails and background. Will see what I can do over the next few days to improve it.
The first version I was working on before it all fell apart a bit is attached if you're curious. Also in Flickr but set to private as I hadn't finished it so not sure if the link will work:
https://www.flickr.com/gp/92067259@N06/Gp8nqF
Cheers,
Chris.