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You're off to a flying start! Well done on your persistence and boy don't we need it these days in Oz with the weather being imaging unfriendly!
A couple of minor suggestions:
1. As you mention you would've liked more exposure time (don't we all!) and I take it you used 2x2 binning with your QHY8 and there is some background noise. You could download a free trial of Noise Ninja and run that and it will help. Or perhaps even moving the black point a tad more in levels or even using the blur tool and smoothing out the heavier areas of noise.
If you don't then when you do your mix of the Ha with the RGB colour you'll get that noise showing up as red and it will be more intrusive at the point.
Then do selective sharpening on the horse itself to sharpen only that area up and nothing else.
2. The Tarantula core is slightly overblown. You could lasso it and use curves/levels or shadows/highlights to get the detail back in the blown areas and then do 1 above to selectively sharpen the Tarantula neb area itself.
Greg.
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