Astro Art and 2nd try on The Veil

[Craig123]

Hi all

I tried putting together my first Bi colour image in Astro art last night  of the witches Broom/western Veil having captured about 9 hours of Ha and Oiii. Does anyone have an  advice or tips  or cc on improving this from a processing or capture point of view as having got to this stage i haven't really much idea about processing it. I have seen some pictures where the the number of stars seem to have been reduced so the nebula stands out more. Subs were 20 minutes and i processed out vignetting etc in PS rather than using calibration frames. Would adding S ii have an a big effect on the image and if aquire more subs generally will it benefit from more detail.

11 x 20 mins 0 iii

17 x20 mins Ha

Atik 314l on Skywatcher Ed80 

Many thanks