This is a sensational image Bert, one of the best like it I have seen for sure and certainly your best to date.
The contrast you have managed to show in the dark rivuletes is nicely balanced. Sometimes when trying to reveal these structures an unrealistic look is created, shadow highlights in PS can especially do this if you are not careful, but here you have handled it masterfully.
The Lagoon and Trifid area is perfect, they look natural and well balanced with perfect colour, in fact the whole image is pretty well perfect and most of all - believable. It looks like it is a snapshot in time taken in one go rather than a mozaic with high res, almost out of place, data blended in to show more detail in the good bits which some other attempts at this and nearby regions, have displayed.
This result lends weight to the argument of why bother mozaicing with a telescope when you can do just as good a job but much quicker with a good quality camera lens
Mike