Well to me it looks pretty good Greg
the stars look ok to me too, you have some hard critics
perhaps the blue is a little too cyan-white in the arms and I like a less magenta more yellow core area but it's certainly not a big issue and the background looks fine to me
... overall looks good with plenty of detail.
I did however notice there are two bright stars missing from your shot near the galaxy, I am assuming something in your layering has blotted them out...see if you can spot'em
Mike