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the redder bits of nebulosity are real
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And natural. I have seen many photos of Eta nebula. Each one with different colors. Some very red, others very blue. I prefer like yours. There are red, but this part of nebula is more blue, with some reflexion of red.
The keyhole is very clear, with many details. A more sharp filter applied with mask will bring out the interior and their details. You did with 150 mm, I did with 305 mm. Your photo has as much details than mine.
http://astronomia-e-astrofotos.10697...417-detail.jpg (from
http://astronomia-e-astrofotos.10697...14-td1414.html)
And it was not with hour of exposition. That's the point !
Great capture !