Hi EZY
This is a great image!
I tend to agree with Richi poo though, the red/magenta looks too bold to me an perhaps a little over saturated? Can you tone it down and see what it looks like?
One good way to test how well the reds are coming out here is to compare the two nebulae NGC 3576 and it's neigbour NGC 3603. NGC 3603 should be "redder" and less magenta because it is twice as far away as NGC 3576 and thus suffers from significantly more interstella reddening. The thing that actually imparts the blue to nebulae is often the H Betta emission and this turns the HII regions more magenta than red.
David Malin mentioned this actually at the 2006 David Malin Awards. He said that too often emission nebulae are presented as very red and miss the blue/magenta component. He also said that often the red and/or magenta are displayed far too saturated and vivididly suggesting this was mostly due to the memories of the look achieved by the polular red bias film in the old days that always showed nebulae as blood red. The film was relatively insensitive to the H-Betta and thus didn't pick up the blue very well, if at all.
Of course there are many ways an image can be presented and no way is "wrong" but I thought these comments were very interesting and food for thought.
BTW it "could" have been my image you were loking at as I also had an NGC 3576 published in AS&T too
(600K)
http://www.pbase.com/strongmanmike20...74724/original
Here is an image showing the distinct colour difference between NGC 3576 and NGC 3603
(550K)
http://upload.pbase.com/strongmanmik...10477/original
Now go to sleep!
Mike