Nice image, the green colouration on the limb does look a little odd (which might be fixable in Registax), and you are oversampling with the 3x Barlow (the ASI290MC prefers f/15 instead of the f/24+ that you are using here). Not sure what you are using PIPP for (hopefully not debayering), unless there's a really good reason you should go straight to AS!3.
However, you captured a lot of detail there, so there's a lot to work with. I hope you don't mind, but just to give you a bit of inspiration I took a screen grab of your image, reduced the noise, white balanced it using the polar ice cap as the "white point", upped the red channel a bit more then played with the levels a bit to produce this. You may hate my treatment as well, feel free to come up with your own!
Keep it up!
Andrew
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