Nice image and I am surprised you got the outer ring so clearly in just 3 hours.
I agree with Mike its too yellow/brown, you can see it in the surrounding star colours.
One of the NASA pictures talks about the blue in the core.
Here's my 9 hour + effort and looks like I could get more out of the processing but this is what I got:
https://pbase.com/gregbradley/image/154574611/large
Greg.