It is an awesome image. I have seen this whole area done like this before, but using a DSLR and a refractor in a mosaic format. I'm not sure how many people realize how much dust is in this whole region.
As for the colours, it is very subjective and open to interpretation. Each imager has his or her own idea of how they want to present the final product, and , after all, so many of us are actually visual artists, not scientists, leading to a huge variation in end result.
Top job.
