Very deep image. Lots of Ha detail there. The red is too dominant though and that is coming from your Ha blend. The Ha is dominating the colour.
There should be some light blues in the centre and the stars should have more colour.
Have a look at Rob Gendlers website as he has some Ha blending methods that can help there. Ha blending is an art as Ha can easily take over the image. Probably a Ha and Luminance combine first. You can also add a bit of Ha as a luminosity layer with the opacity slider down a bit (maybe only 15%) to get detail as well but it will weaken colours and shift colours a lot so in moderation only.
Greg.
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