Yeh not bad at all Greg, some nice rich colours there, I like it.
The halo looks a bit too blue though (very few young stars out there) and while the background core should certainly be bright you might like to try increasing the dynamic range just a bit to reveal a few more details in the brighter more exposed bits in front?
The halo of Cen A is actually not uniform either but rather has subtle dark patches and shells within, not sure whether you can bring these out..? maybe give it a go? It's hard to show everything in one single image... I know
Great image
Mike