Agree with all of the above! Very nicely done Colin!
It's also very nice to see someone else doing some "natural" palette work and making a good job of it! Using Ha and OIII to augment the RGB colours is the way to go for an object like this.
My only minor critique (and I mean
minor) is that your bright star profiles look a little "blocky" (harder edges) - as opposed to a more Gaussian shape (softer edges).
Doesn't detract from the image though - I just notice these things.
