Hi Andrés, this is an excellent image! Congrats!
Nice and natural contrast in all the image, the only thing I think would look better is the dark nebula that seems too dark and with clipped regions.
I tried to reproduce step by step your processing while protecting that area and of course I couldn't. My CC gave a very different result, so I adjusted HT at the end to be near to your colors.
Previous to TGV Denoise I made a RangeMask to protect dark areas and leave there the noise like it was.
temporary linkSaludos,
Alejandro.