I take it that the comet is leaving the trail in the top left. These images do not seem to be in the correct order, which is confusing.
I have no experience with astrophotography, but I am impressed by the star images.
Thanks to the online videos my technique in AP is improving especially in removing noise (live de-noise filter) in my astro photos.
All processing in AP except stacking, gradient removal and conversion from FITS format.
Q - does AP have any form of gradient removal?
This is one of M51 (Whirlpool Galaxy) from last night. As the clouds rolled in early I only managed 10 minutes each of R, G and B yet AA still brings out the colours (other packages have never managed this). The luminance was 45 minutes total