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I think you have some decent data on the galaxy. Great. I think others have made good suggestions re colour and smoothing. My comment is the stars....they look blown and blobby and to me are not round enough in several places. Is this tracking or optics (coma, tilt, etc)? The image would look great I think if you took a bunch of shorter exposures just for the stars. The brightest stars may still blow out no matter what you do, but the medium brightness stars should not and you ought to be able to get some great colour and smaller stars. Once data is blown there is no colour data left! (Just on the very off chance that you don't know the word "blown" it is when your wells on the CCD/CMOS are totally filled and additional electrons cannot be captured - hence short exposures.) Just replace your old stars with new...
Peter
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